Accurate Color Reproduction Workflow Guide

This document was prepared by Phase One’s Cultural Heritage team. For feedback and general inquiries please contact one of the team members:

Carsten Wieser [email protected] Yair Shahar [email protected] Peter Stig-Nielsen [email protected]

Liability Phase One disclaims any and all liabilities from the interpretation and use of the information presented in this document. All content and images are provided on an “as is” basis. Any images and/or information used or obtained from this document is done at your own risk and you will be solely responsible for all damage, including but not limited to damage to your computer system, hardware or loss of data.

Trademarks & acknowledgements Capture One and Phase One are either registered trademarks or trademarks of Phase One A/S in the European Union and/or other countries. All other trademarks are the property of their respective owners.

Revision: 04. July 2015.

COCH WORKFLOW GUIDE V1.3 2 Phase One – Accurate Color Reproduction Workflow Guide

Index

INTRODUCTION ...... 4 1. BASIC REFERENCES AND TOOLS NEEDED ...... 5 1.1 Imaging Guidelines ...... 5 1.2 Software and Tools used in Workflow ...... 5 2. INTRODUCTION TO ACCURATE REPRODUCTION WORKFLOW...... 6 2.1. Camera set-up ...... 7 2.2. Lights set-up and shielding ...... 7 2.3. ICC profile for accurate color workflow ...... 7 3. ACCURATE REPRODUCTION WORKFLOW USING READY-MADE ICC PROFILES OF CAPTURE ONE CH ...... 8 3.1. Choosing Basic settings (Mode) for Reproduction Workflow in Capture One CH ...... 8 3.2 Choosing the ICC-Profile from Capture One CH ...... 9 3.3 Choosing the Curve from Capture One CH ...... 9 3.4. Preparing luminance uniformity using the LCC Tool in Capture One ...... 10 3.5. LCC in the daily workflow for luminance uniformity...... 12 3.5.1. How to automatically apply an LCC profile to every new image ...... 12 3.5.2. Manual application of an LCC profile ...... 12 3.6. Setting the correct exposure and White Balance ...... 13 3.7. Checklist for Workflow listed in Chapter 3 ...... 15 4. ACCURATE REPRODUCTION WORKFLOW USING CUSTOM ICC PROFILES ...... 16 4.1 Preparing Capture One to create a custom ICC Profile ...... 16 4.2 Preparing luminance uniformity using the LCC Tool in Capture One ...... 17 4.3.1. How to automatically apply an LCC profile to every new image ...... 19 4.3.2. Manual application of an LCC profile ...... 19 4.4. Capturing image of Xrite ColorChecker SG color target ...... 20 4.4.1 Setting the correct exposure ...... 20 4.4.2 Setting the correct white balance ...... 21 4.5. Exporting a reference image of Xrite ColorChecker SG color target ...... 22 4.5.1 Crop the ColorChecker SG color target ...... 22 4.5.2 Exporting the reference image for a custom ICC profile ...... 23 4.6. Creating a custom ICC-Profile using BasICColor Input ...... 25 4.7. Setting up the workflow in Capture One using custom ICC-Profile ...... 27 4.8. Checklist to Workflow listed in Chapter 4 ...... 28 5. ANALYSIS AND VERIFICATION OF IMAGES ACCORDING TO IMAGING GUIDELINES USING WWW.DELT.AE ...... 29 6. OTHER CONSIDERATIONS ...... 33 6.1. Capture One CH LAB color readout ...... 33 6.2. Advantages of reprographic camera system vs. scanner solution ...... 34 6.3. General Workflow ...... 36

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Introduction

This guide is aimed at the advanced Capture One users who work in the field of art and cultural heritage reproduction. It provides a step-by-step workflow starting with the basic studio and environment setup including camera and lighting, through optimization of the capture conditions such as exposure and illumination uniformity, followed by the essential settings and steps in Capture One: ICC input profiles, Develop curves and processing Recipes, and finishing with instructions on how to create custom ICC profiles and how to analyse and verify them using 3rd party software.

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1. Basic references and tools needed

1.1 Imaging Guidelines

For detailed information to the popular Imaging Guidelines in the Cultural Heritage World please look at their dedicated website:

Metamorfoze Preservation Imaging Guidelines Hans van Dormolen National Library of the Netherlands Website: http://www.metamorfoze.nl

FADGI – Federal Agencies Digitization Guidelines Initiative Technical Guidelines for the Still Image Digitization of Cultural Heritage Materials Website: http://www.digitizationguidelines.gov

1.2 Software and Tools used in Workflow

Software: Phase One Capture One CH Optional: Phase One Capture One 8 Pro * Phase One Capture One 8 DB * *Certain CH- specific tools such as Auto Crop and smart Positive<>Negative inversion are missing in the DB and PRO versions and therefore some functionality may require several manual steps, losing the efficiency and convenience offered by the CH version. ICC profile: Phase One Capture One CH ready-made ICC profiles for accurate color workflow Optional: basICColor Input software for custom ICC profile generation

Color Target: Xrite Color Checker SG Optional: A range of color targets can be used, including Xrite ColorChecker SG, Golden Thread Device-level Target, UTT Device-level Target

Color Target Verification: Delt.ae A website with on-line verification of files holding a color target, including the compliance to Metamorfoze and FADGI Imaging Guidelines. (http://www.delt.ae) Your own “see-through” color target file with the exact spectro-photometer readings of the colors in all patches, and a “see-through” hole in middle of each patch Optional: IQ-Analyzer Software from Image Engineering (http://www.image-engineering.de) GoldenThread Analysis Software from Image Science Associates (http://www.imagescienceassiciates.com)

Reference for Illumination Uniformity using LCC-Tool in Capture One: Plain White paper cardboard in a size covering the entire field of view.

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2. Introduction to Accurate Reproduction Workflow

One of the key elements in digitization of cultural heritage collections is the ability to reproduce colors accurately, to stay true to the original so that the images can be reviewed and used many years later knowing that they represent even the most sacred and rare collections in the best possible way.

At Phase One, we combine science and theory with practical experience from the early days of digital capture, working with the world’s most respected institutes and employing the best scientists and engineers, to provide a robust, consistent, efficient workflow for reproducing colors of a wide range of materials from film negatives through old masters paintings to rare manuscripts, under various lighting conditions such as flash, tungsten and LED.

Capture One CH comes equipped with a set of ready-made ICC profiles that are specifically and carefully designed to use our cameras’ wide dynamic range. Compared to some leading 3rd party color workflow solutions, the ICC profiles in Capture One CH fulfils the most demanding guidelines from FADGI and Metamorfoze, but they also cater for subtle tonality changes and gradations to be recorded accurately and preserving the natural look of the original subject.

The images below (flowers) demonstrate the difference between a 3rd party custom ICC profile and a Phase One ready-made profile. Both images receive high scores when analysed in e.g. Delt.ae, however, only the one created with the Phase One profile manages to preserve the subtleties of the flower’s pink color. This is a result of years of experience in capturing both 2D and 3D objects from portraits through to cars where varying lighting conditions produce a third dimension by drawing shadows and highlights. The Phase One ICC profiles are able to record minor changes throughout the tonal range of the image without any artefacts or loss of detail.

3rd Party ICC Profile Phase One ICC Profile

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There are several important aspects to take into account when preparing a camera-setup for an accurate reproduction workflow for digitization-projects purposes.

2.1. Camera set-up

A solid and sturdy repro stand is required to support good still captures. The choice of a suitable camera system for reproduction workflow can be a dedicated repro camera or SLR-type camera on which the capture mode can be set to be vibration-free by the use of mirror-up and a self-timed shutter release.

2.2. Lights set-up and shielding

The reprographic camera system will need to be solidly installed with lights and shielding to avoid stray light and reflections from neighbouring workstations. This is typically done using dark curtains or boards, which are built around the reprographic camera system.

The lights should be positioned so that the light hits the subject at an incident angle of 45 degrees. With this requirement in place, the captured colors of a color target can be matched to the spectrophotometer-measured values delivered with your color target.

If the lights are installed such that the incident angle is varying from the 45 degree, this can greatly influence the measured color values of the patches of the color target. In such cases the use of the captured color values as basis for generating an ICC profile using 3rd party software can generate unreliable results. A capture of the SG color target using lights positioned to deliver incident angles between 30 and 60 degrees can deliver color differences of up to 11 deltaE.

2.3. ICC profile for accurate color workflow

To set up an accurate color workflow you need to decide which ICC profile to use. With Capture One CH two options are available: the ready-made ICC profiles of Capture One CH and the “do-it- yourself “ 3rd. party generated ICC profile.

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3. Accurate Reproduction Workflow using ready-made ICC profiles of Capture One CH

Capture One CH contains several new helpful tools and features that are specially designed for a reproduction workflow. The following chapter shows the basic setup of Capture One CH and guides through the steps necessary for achieving a high quality and accurate reproduction workflow complying with the most stringent requirements (level 1) of the Metamorfoze and FADGI Imaging Guidelines.

3.1. Choosing Basic settings (Mode) for Reproduction Workflow in Capture One CH

From the tool panel, select the Color tool tab

The Base Characteristics tool inside Capture One CH includes additional options not available in Capture One 8 Pro or Capture One 8 DB.

A Mode selection is added in the Base Characteristics tool and is unique to Capture One CH. It allows the user to select basic parameters for various common workflows and easily choose between the different options. Three modes are available:

- Photography : Use this mode for all reprographic and photographic tasks. (but NOT for reproduction of film) - Repro Positive: Use this mode for reproducing positive films. - Repro Negative: Use these modes only for reproducing negative films.

These two film modes take into account the very unlinear tone and color distribution found in film originals.

For 2D flat art reproduction and digitizing of books choose Photography

Tip: The Repro Negative mode inverts the image tonal value internally. Through this a negative image from a color negative film is automatically converted to a positive image. After this all Tools in Capture One CH behave normally, like with any positive original. COCH WORKFLOW GUIDE V1.3 8 Phase One – Accurate Color Reproduction Workflow Guide

3.2 Choosing the ICC-Profile from Capture One CH

Along with our standard ICC Profiles, Capture One CH provides a list of specially designed ICC Profiles for reproduction work. These are selectable in the Cultural Heritage folder inside the ICC profile menu.

Profile description:

ICC Profile Description Made for a setup with flashlight using heads with attached rectangular soft Flash boxes Made for Model LED Area 48 Panels (5600K) from BBS Lighting. LED Area 48 (www.bbslighting.com) Made for LED light from Digital Transitions, Model DT 36 INCH LED. LED DTLED36 (www.digitaltransitions.com) LED Rosco Made for LED light from Rosco, Model LitePad Axiom Daylight. LitePad Axiom (www.rosco.com) Daylight Made for LED light from North Light, also used in DT BC-100 Book Capture North Light HID System. (www.northlightproducts.com) Tungsten Made for a setup with Tungsten lights (3200K) For more information about Capture One 8 CH specialized ICC-Profiles please refer to Chapter 3

3.3 Choosing the Curve from Capture One CH

1. For 2D flat art reproduction and digitization of books, choose a specialized ICC-Profile in Capture One CH suitable for your light source. (explained in Chapter 3.2)

2a. Choose the “Linear Response” curve for most reproduction work including oil paintings. The linear response curve is over all a linear curve but it has a build in compression of the high lights and will preserve tone and color in the highlights.

2b. Choose the “Linear Scientific” curve for absolute linear tonal values.

Use this curve primarily if you validate the color-accuracy of you system or if you are reproducing true 2D artwork. An oil painting is not true 2D as the pensile strokes in the oil painting is 3D and reflects the light source. Using the Linear Scientific curve in such a case will lead to clipped data in the reflections.

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3.4. Preparing luminance uniformity using the LCC Tool in Capture One

The LCC Tool helps you to create luminance uniformity for your reprographic setup.

You will need to have a plain white cardboard and to follow these steps using the LCC tool:

1. Place the plain white cardboard on the surface of your repro table. It will act as a reference to evaluate the difference in luminance created by the light source.

Make sure that you place it in the correct angle to the camera and that it covers the complete field of view. It is important that there are no objects other than the white board visible in the image. Therefore choose a plain white cardboard that is larger than the material you want to photograph, otherwise the luminance correction calculated in the software could be incorrect.

2. Capture an image of this scene and set an exposure to make the White cardboard look like middle grey with L values of approx. 121. Adjust only shutter speed or the strength of the light source for balancing the exposure. The aperture has a significant influence on this reference and should be set to the value you want to use for image capture (the image should look similar to the sample shown).

3. You can now generate an LCC profile from the image of the white cardboard. There are two possible ways to begin:

4. First method: Right-Click on a thumbnail-image (containing a capture from the white cardboard) in your image browser to calculate the luminance correction. Tip: On a Mac without right mouse button you can also use “CTRL + mouse click” for entering the context menu. Please choose Create LCC… Note: You have to prepare a new LCC-profile to create luminance uniformity after: - Changing the aperture - Changing the distance to the subject - Changing the angles of the light setup (except for power value) - After changing the lens or Digital Back.

An LCC profile is only valid and useable for images taken with the same Digital Back or Camera under identical lighting conditions

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5. The second method is via the Lens tool tab

Select the image of the captured white cardboard in the Browser and choose Create LCC… in the LCC tool.

6. After pressing Create LCC (either started with the first or second method), a dialog box will open showing the following options for the LCC profile that will be calculated.

DO NOT choose any of the options. Press Create to start the calculating process.

7. After calculating you should see the selected reference image of the captured white cardboard marked as a LCC reference file. The letters LCC will appear above the thumbnail image. In the LCC tool the boxes for Color Cast and Enable Uniform Light should be checked and available. You have now created a valid LCC-profile for this capture setup.

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3.5. LCC in the daily workflow for luminance uniformity

3.5.1. How to automatically apply an LCC profile to every new image

In the Camera tool tab there is a tool called Next Capture Adjustments

When shooting tethered with the camera attached to the computer, you can choose the settings and adjustments to be applied to the next capture. The factory default setting is useful in this example to automatically apply the LCC profile.

The first option – ICC Profile is set to Default in the factory default settings So it will choose the ICC Profile you set in the Base Characteristics tool (See also Chapter 3.2)

The next option is All Other where the factory default setting is Copy from Last. This will ensure that every setting that is made with one of the Tools in Capture One is automatically applied to the next captured image. This includes the newly created LCC profile from the last image. All subsequent images will be corrected, until you make changes to the lighting.

3.5.2. Manual application of an LCC profile

To manually apply an LCC profile to another image, select the LCC reference image (with the letters LCC tagged above) together with all images that you wish to apply this LCC profile to. Then Right-click on one of the images with your mouse or CTRL-click to access the context menu and select Apply LCC.

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3.6. Setting the correct exposure and White Balance

To create accurate images, correct exposure is essential. It ensures that the image is an optimal digital copy of your real world item. A correctly exposed image ensures no lost details or clipping in the highlights and the shadows and is also the base for accurate colors.

Use the shutter speed and/or the power settings of your light source to adjust the exposure. Choose the optimal aperture for your lens (mostly f8 or f11) to achieve highest details. If you work with an LCC profile for illumination uniformity make sure you create the LCC using the same optimal aperture. Make the correct exposure setting for your subject after calculating an LCC profile.

To ensure correct exposure, measure specific RGB values in your chosen target.

You can measure the RGB values by hovering the cursor over the image in the viewer. The RGB values are shown in the middle above the image, close to the Cursor Tools.

Tip! Capture One also provides an option to have multiple RGB-readouts displayed in various areas of the image. You can add and place the Color Readout picker through a longer mouse click on the second icon from the right, in the Cursor Tools

The ColorCheckerSG color target is a useful tool to check the correct exposure. Capture an image and measure the RGB values at patch E5. If the exposure is correct, this patch will have a value of 246 in Adobe RGB 1998.

Adjust the shutter speed or light output (from your light sources) to achieve this exposure rather than using the Exposure Tool in Capture One.

Although a small adjustment in the software can be used to achieve an exact match.

You can also set a correct White Balance at patch F5 for the scene. (For more details to setting the white balance please refer to chapter 4.4.2 on page 21)

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Important!

Color values in Captue One are depending on the selected Proof Profile. Therefore in the view menu make sure to select “Selected Recipe” as the “Proof Profile”.

In your selected recipe you need to specify the ICC profile to be used for the destination workspace. Color values in Capture One are now in relation to that workspace.

If you chose to use “embed only” as ICC profile for the destination the color values in Capture One are in a gamma 1.8 space.

Corresponding RGB values for different ICC workflow setup insuring a perfect exposure of the Xrite SG Color Target:

Destination color space: patchE5 (white) Patch F5 (Almost white)

Adobe RGB (1998) (Gamma 2.2) 246 197

ProPhoto RGB (Gamma 1.8) 244 186

ECI-RGB-v2 (L*) 246 203

Imbed (No color Correction) 244 186

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3.7. Checklist for Workflow listed in Chapter 3

Chapter Topic 2 Note the Introduction to Accurate Reproduction Workflow ☐

3.1. Choose Basic setting (Mode) for Reproduction Workflow in Capture One CH ☐

3.2. Choose “ready-made ICC-Profile” suitable for your Back and Light Source ☐

3.3. Choose Curve Linear Scientific or Linear Response ☐ Set correct field of view to your flat art objects (through moving camera up ☐ and down at your repro-column) so that it is fully covered. Set correct focus on your camera ☐ If you need luminance uniformity use the LCC Tool in Capture One 3.4. ☐ Use a plain white cardboard sheet to make an LCC Profile 3.4. Capture an Image of the scene (White cardboard) ☐

3.4. Create a LCC reference file ☐

3.6. Place your Xrite ColorChecker SG in the scene ☐

3.6 Set correct exposure ☐

3.6/4.4.2 Set correct white balance ☐

Ready to begin digitizing your flat art objects

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4. Accurate Reproduction Workflow using custom ICC profiles

ICC Profiles are essential to achieving accurate color handling in your reproduction workflow. Capture One CH already contains a wide list of ready-made ICC profiles for high accuracy color reproduction for digitizing projects in Cultural Heritage use. However, sometimes these ready-made ICC profiles of Capture One CH do not fit your environment, equipment or lighting. Alternatively, you may be using Capture One 8 Pro or Capture One 8 DB, which do not contain our ready-made ICC profiles made for Reproduction use. The following chapter shows a possible workflow for creating a custom ICC-Profile using 3rd Party Software. In this example we use BasICColor Input. The aim is achieving a high quality and accurate reproduction workflow complying with the most stringent requirements (level I) of the Metamorfoze and FADGI Imaging Guidelines.

4.1 Preparing Capture One to create a custom ICC Profile

To create a custom ICC Profile Capture One should be prepared with the following settings:

1. From the tool panel, select the Color tool tab

a. If using Capture One CH, choose the Base Characteristics Tool and set the values as shown in the image below:

It may be necessary to select Show All from the ICC Profile Menu in order to gain access to all the ICC-profiles; the No color correction Profile can be found in the Effects sub-folder.

b. If using Capture One 8 DB or Capture One 8 Pro, choose the Base Characteristics Tool and set the values as shown in the image below It may be necessary to select Show All from the ICC Profile Menu in order to gain access to all the ICC-profiles; the No color correction Profile can be found in the Effects sub-folder.

Tip: It is useful to save these values as a default for the camera that is attached so that these settings do not change before the custom ICC Profile is created.

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4.2 Preparing luminance uniformity using the LCC Tool in Capture One

The LCC Tool helps you to create luminance uniformity for your reprographic setup.

You will need to have a plain white cardboard prepared and to follow these steps using the LCC tool:

1. Place the plain white cardboard on the surface of your repro table. It will act as a reference to evaluate the difference in luminance created by the light source.

Make sure that you place it in the correct angle to the camera and that it covers the complete field of view. It is important that there are no objects other than the white board visible in the image. Therefore choose a plain white cardboard that is larger than the material you want to photograph. Otherwise the luminance correction calculated in the software could be incorrect.

2. Capture an image of this scene and set an exposure to make the white cardboard look like middle grey with L values of approx. 121. Adjust only shutter speed or the strength of the light source for balancing the exposure. The aperture has a significant influence on this reference and should be set to the value you want to use for image capture (the image should look similar to the sample shown).

3. You can now generate an LCC profile from the image of the white cardboard. There are two possible ways to begin:

4. First method: Right-Click on a thumbnail-image (containing a capture from the white cardboard) in your image browser to calculate the luminance correction. Tip: On a Mac without right mouse button you can also use “CTRL + mouse click” for entering the context menu. Please choose here Create LCC… Note: You have to prepare a new LCC-profile to create luminance uniformity after: - Changing the aperture - Changing the distance to the subject - Changing the angles of the light setup (except for power value) - After changing the lens or Digital Back.

An LCC profile is only valid and useable for images taken with the same Digital Back or Camera under identical lighting conditions

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5. The second method is via the Lens tool tab

Select the image of the captured white cardboard in the Browser and choose Create LCC in the LCC tool.

6. After pressing Create LCC (either started with the first or second method), a dialog box will open showing the following options for the LCC profile that will be calculated.

DO NOT choose any of the options and press Create to start the calculating process.

7. After calculating you should see the selected reference image of the captured white cardboard marked as an LCC reference file. The letters LCC will appear above the thumbnail image. In the LCC tool the boxes for Color Cast and Enable Uniform Light should be checked and available. You have now created a valid LCC-profile for this capture setup.

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4.3 LCC in the daily workflow for luminance uniformity

4.3.1. How to automatically apply an LCC profile to every new image

In the Camera Tool tab there is a tool called Next Capture Adjustments

Option One: ICC Profile is set to Default in the factory default settings So it will choose the ICC Profile you set in the Base Characteristics tool (see also Chapter 3.2)

Option Two: All Other where the factory default setting is Copy from Last. This will ensure that every setting that is made with the Tools in Capture One is automatically applied to the next captured image. This includes the newly created LCC profile from the last image. All subsequent images will be corrected, until you make changes to the lighting.

4.3.2. Manual application of an LCC profile

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4.4. Capturing image of Xrite ColorChecker SG color target

4.4.1 Setting the correct exposure

First, take an image of the Xrite ColorChecker SG colour chart. It is important that the light source is setup correctly as described in Chapter 2.2.

To create a valid Xrite ColorChecker SG reference image you must set the correct exposure. In addition, you must ensure that a correct LCC profile is used to provide uniform illumination across the image.

Use the shutter speed and/or the power settings of your light source to adjust the exposure. DO NOT change the aperture. Use the same settings that were used to create the LCC profile.

To ensure correct exposure, measure specific RGB values in your chosen target.

You can measure the RGB values by hovering the cursor over the image in the viewer. The RGB values are shown in the middle above the image, close to the Cursor Tools.

Capture One also provides an option to have multiple RGB- readouts displayed in various areas of an image. You can add and place the Color Readout picker through a longer mouse click on the second icon from the right, in the Cursor Tools.

To achieve the best possible results in creating a custom ICC profile, and to have the best chance to pass the Imaging Guidelines like FADGI or Metamorfoze, the ColorCheckerSG patch E5 should have a value of 244 for the correct exposure.

(Information! We use here No Color Correction as an ICC Profile to create the reference file. Therefore the value has to be 244. For more information please look at page 14)

Adjust the shutter speed or light output (from your light sources) to achieve this exposure rather than using the Exposure Tool in Capture One.

Although a small adjustment in the software can be used to achieve an exact match.

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4.4.2 Setting the correct white balance

Setting the correct white balance is as important as setting the correct exposure. The white balance can be measured with the white balance picker.

The White Balance picker is located in the Cursor Tools.

It can also be found in the Color Tool Tab in the White Balance Tool or in the Capture Tool Tab in the Camera Tool.

Setting a white balance with the ColorChecker SG color target should be done on patch F5.

Click on patch F5 with the White Balance cursor. The RGB values should become equal after clicking to set the White Balance, or have a maximum of one or two values in difference.

Tip: For a Phase One IQ Digital Back it is also possible to store the measured white balance into the Digital Back itself. In the Camera tool, choose one of the Three Custom White Balance Pre-sets. Use the white balance picker to measure on the ColorChecker SG color chart and then double-click the Set button. The WB will be stored into the Digital Back.

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4.5. Exporting a reference image of Xrite ColorChecker SG color target

To export a valid reference image you have to use the following steps:

4.5.1 Crop the ColorChecker SG color target

The CCSG target has to be cropped out of the image. The export file should only contain the target.

1a. If you are using Capture One CH the easiest way is to use the Autocrop Tool

1. Select the image to be cropped. 2. Select Method Generic 3. Select Straighten Top Edge 4. Click the Auto Crop Button

The CCSG target should be automatically straightened and cropped.

1b. If you are using Capture One 8 DB or Capture One 8 Pro:

From the Tool panel, select the Crop Tool Tab

Select the crop tool and create a crop in the image. Only the Xrite ColorChecker SG target should be marked.

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1c. Depending on how accurately you have positioned your ColorChecker SG color target, you may need to rotate the image before cropping.

From the Tool panel, select the Rotation & Flip Tool

Select the Straighten Tool and draw a line along the edge of the ColorChecker SG target or between the crosses if your CCSG has them.

Tip: You can also find the Crop and the Straighten tools in the Cursor Tools.

4.5.2 Exporting the reference image for a custom ICC profile

1. From the tools panel, select the Output tool tab

2. Add a new recipe by clicking on the + button and type in a name for the new recipe.

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3. Choose the TIFF File Format in 16bit, Uncompressed.

4. Choose the Embed camera profile ICC Profile

Note: These settings along with the No Color Correction that you chose in the Base Characteristic tool ensure that you export a completely linear file.

5. To Export the TIFF file

5a. Ensure that the box to the Left of your new defined Recipe is checked, and no other Recipes are checked.

Tip: To easily identify the exported reference image you can use the Output Naming Tool located in the Output Tool Tab and add a Job name. For example add “_CCSG” to the reference image.

6. To export the TIFF file select the image in the browser

7a. Click Process in the Process Summary Tool that is located in the Output Tool Tab.

7b. Or click the Process Symbol in the upper Toolbar.

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4.6. Creating a custom ICC-Profile using BasICColor Input

To create a custom ICC Profile for a reproduction workflow you can use a third party application such as BasICColor Input. It is available for both MacOS and Windows. This guide is created using BasICColor Input 3.5.1 on a Mac (the workflow in Windows should be similar).

1. After starting the application the program’s main window will open where you have to select two items: a. The exported reference image of the Xrite ColorChecker SG color chart that was created following steps in chapter 4.1 to 4.5.2 in this manual. b. The reference file suitable to your Xrite ColorChecker SG color chart. This file is included in the BasicColor software.

c. When using the Xrite ColorCheckerSG, select:

-> Reflective

-> GretagMacbeth/Xrite

-> Digital Color Checker SG

-> Digital ColorChecker SG colorimetric.txt

2. An overlay grid will appear with 140 measuring fields from the Color Checker SG.

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3. Place the grid over the image of your Xrite Color Checker SG using the four corners of the grid to move and fit. Ensure that all measuring fields cover only a single patch.

After placing the grid correctly you will have a first view of the quality of your reference image. The light bulb symbols are placed over the white patches around the chart’s edges and if they show green borders this means that all white patches on the ColorChecker SG have the same luminosity

4. Name your profile and select the Illumination type, for example CIE_D50 when using Flash and set the Observer field to 2°.

Tip: If you follow the naming convention used for Phase One ICC Profiles, Capture One will automatically place it together with the Original ICC-Profiles that came by default with Capture One.

Start naming with the Product Name like e.g.:

PhaseOneIQ180-CustomICCprofile.icc

PhaseOneIQ280-Nameitasyoulike.icc

5. Create your custom ICC profile by clicking on the Create ICC profile button. The new ICC-profile will be automatically saved in the ColorSync Folder of your Operating System.

6. Close the BasicColor application and restart Capture One.

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4.7. Setting up the workflow in Capture One using custom ICC-Profile

1. Restart the Capture One Application if you added a custom ICC Profile from another application. This allows Capture One to recognize the new profile and to add it to the list in the Base Characteristics tool in the Color tool tab.

2. In the Base Characteristics tool, change the ICC-Profile from Phase One Effects No color correction to your own custom made profile.

Note: If you follow the naming convention used for Phase One ICC Profiles, Capture One will automatically place it together with the Original ICC- Profiles that came by default with Capture One. If you name it differently the new ICC-Profile will appear in the Other section in the ICC Profile drop- menu.

3. To ensure that this new custom ICC profile is the new Standard ICC profile for your reproduction workflow, save it by clicking on the 3-points icon on the top-Right corner of the Base Characteristics tool. This will set your new Profile as the default One.

4. Before continuing with your reproduction workflow, change your Output Format to one that is recommended for your archive or guideline.

For archive master file choose*:

Metamorfoze TIFF 16bit ECI RGB v2 Metamorfoze Light TIFF 8bit ECI RGBv2 or AdobeRGB1998 Metamorfoze Extra Light TIFF 8bit Adobe RGB 1998 FADGI 4-star TIFF 16bit AdobeRGB1998 *For more detailed information please look at the Imaging Guidelines

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4.8. Checklist to Workflow listed in Chapter 4

Preparing a reference image of Xrite ColorChecker SG with Capture One to create a custom ICC profile using BasicColor Input.

Chapter Topic 2 Note the Introduction to Accurate Reproduction Workflow ☐ Prepare Capture One to create a custom ICC profile 4.1. ☐ Set ICC Profile “Phase One Effects No Color correction” 4.1. Choose Curve Linear Scientific ☐ Set correct field of view to your flat art objects (through moving camera up ☐ and down your repro-column) so that it is fully covered Set correct focus on your camera ☐ Preparing luminance uniformity using LCC-Tool in Capture One 4.2. ☐ Place plain white cardboard on the surface of your repro table 4.2. Capture a correctly exposed image of the scene (White cardboard) ☐ 4.2. Create an LCC reference file ☐ Place your Xrite ColorChecker SG in the scene ☐ 4.4.1. Set the correct exposure (for capturing reference image of Xrite CCSG) ☐ 4.4.2. Set the correct white balance (for capturing reference image of Xrite CCSG) ☐ 4.5.1. Crop and Align the Xrite ColorChecker SG color target ☐ 4.5.2. Export the reference image for a custom ICC-Profile ☐ Creating a custom ICC-Profile using BasICColor Input 4.6. ☐ Open BasICColor Input application 4.6. Choose exported reference image of Xrite CCSG inside BasICColor application ☐ 4.6. Choose reference file for Xrite CCSG inside BasICColor application ☐ Move Overlay grid above the reference image so that each measuring field 4.6. ☐ covers only one patch at the CCSG 4.6. Name the new ICC-Profile and set Illumination- type and observer ☐ 4.6. Create new ICC-Profile ☐ 4.6. Close BasICColor application and restart Capture One ☐ 4.7. Set-up the workflow in Capture One using the new custom ICC-Profile ☐ Ready to begin digitizing your flat art objects

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5. Analysis and verification of Images according to Imaging Guidelines using www.delt.ae

To analyse and verify your images according to Metamorfoze and/or FADGI Imaging Guidelines you can use the free web service http://www.delta.ae from Picturae. This description contains the workflow using a Golden Thread Device Level Target.

This website is designed to help you assess image quality based on test and calibration targets present in your images along with guideline conformity from Metamorfoze and/or FADGI Imaging Guidelines.

To use this service place a supported test and calibration target into your image that was made in your reproduction workflow.

To see what type of targets are supported and how to place them correctly in your image, please refer to the Delt.ae Wiki on their webpage: http://delt.ae/wiki

There you will also find a list of supported file formats, color types and file usage limits to the images you want to upload and analyse/ verify.

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Example procedure for verification of an image to Metamorfoze and FADGI Imaging Guidelines using www.delt.ae with a Golden Thread Device Level Target:

1. Open the www.delt.ae webpage in your Browser and login into your account with your Email address and Password. If you are new to this service please register.

2. Upload your file with the included Test- and calibration-Target.

3. Once upload is complete the file will automatically be processed and you can click on results to see the report.

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3. Results of the Golden Thread Device Level Target for FADGI Imaging Guidelines: You will find the rating for Spatial Accuracy and Color Accuracy in the two top boxes.

4. In the Guideline box, on the right, you can choose between the different Guidelines. The results will change in the two top boxes. The image below shows the rating for Spatial Accuracy and Color Accuracy according to the Metamorfoze Imaging Guideline.

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5. If you select None in the Guideline box, you will see all measured results in numbers in the upper boxes.

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6. Other Considerations

6.1. Capture One CH LAB color readout -> Matching Lab conversion to 3rd party software Most ICC profiles can be interpreted in several ways. To obtain the same results as a 3rd party implementation, it is necessary to select an interpretation that matches this behavior. This is done under the View drop-down menu: Capture One supports many variations on the interpretation. However, in some circumstances it may be necessary to configure the 3rd party application as well. Generally, it is necessary to disable Black Point Compensation (BPC) in the 3rd party application for color spaces that are unable to represent black. Note that some applications enables BPC when the Perceptual rendering intent is selected regardless of any other setting.

Generic conversion: There are two generic options available in Capture One: Generic (D50) and Generic (media white). The first converts Lab values using D50 as the white point. This will match most 3rd party implementations including the following: Delt.ae (by Picturae, see http://delt.ae/) CMS (by Marti Maria).

The second option, which uses media white as the white point, can be used to match colors while avoiding chromatic adaptation. for this option, the Lab coordinates need to be measured with a device that takes into account the light source of the specific profile. For sRGB and Adobe RGB (1998) this is D65.

Adobe Photoshop: By default, Adobe Photoshop® uses the Adobe Color Engine (ACE) for color management. To match this, select one of the Adobe modes: Adobe (generic) or Adobe (neutral). The latter should be chosen for the sRGB profile, because ACE may detect that a certain ICC-profile is an sRGB profile and silently fix any technical issues. Also, since Capture One does not support Black Point Compensation it is necessary to disable this in Photoshop to match output profiles that are unable to represent black. To this end, it is necessary to disable BPC. Even if BPC is disabled, Photoshop® may still apply BPC if the Perceptual intent is selected.

Thus the following settings should be used in Photoshop under Color Settings:

Golden Thread (Image Science Associates) Golden Thread, by Image Science Associates, can analyze an image using either an ICC profile or a built-in specification of a standard color space. To use an ICC profile, select GoldenThread (ICC). Otherwise select the GoldenThread (standard) option. Note that the output profile in Capture One must match the option used in the analysis. While Golden Thread will not use the profile directly in this mode, Capture One must still apply the conversion to the correct color space. COCH WORKFLOW GUIDE V1.3 33 Phase One – Accurate Color Reproduction Workflow Guide

6.2. Advantages of reprographic camera system vs. scanner solution

There are several important advantages of using a reprographic camera system vs. a scanner for digitization project purposes.

Image quality The reprographic camera system delivers an extremely high-resolution capture, with accurate colors and a very high dynamic range. The camera system delivers instant captures and it does so without any movements of the subject matter, or of the sensor. Thus compared to a scanner, the reprographic camera system is faster, it is free of maintenance, and it delivers the highest quality of the “scans”, complying with toughest requirements (level I) of the Metamorfoze and FADGI 4 Star guidelines. On top of that, the reprographic camera system is less susceptible to environmental influences of vibration, dust and false light getting into the capture.

RAW workflow Every capture made by a reprographic camera system using digital back technology produces a RAW file with all the captured pixel information, all associated basic transformations (color, etc) and all metadata. No matter what transformations or processing the raw file is used for, it is always kept intact as RAW. This means you can at any time revert to the original file and use the data for new transformations and new purposes. The creation of RAW images happens without the bias of operators and manufacturers, and it provides the user with the highest degree of control and the ability to create a true preservation digital asset.

Almost all scanner-based solutions assume a given target output file format and output specification and deliver the scans accordingly. Many Repro Scanners have built in Curves, Color and Sharpening attributes that cannot be turned off. The resulting scans cannot be re-purposed.

Productivity / Preflight The reprographic camera may take a little more effort for initial set-up of the scanning environment and for preparing the daily production. To ease this, the workflow is usually split into two: an Admin set of operations performed at the start of the day, and a Production workflow for positioning originals and pushing the capture button or pedal.

These workflows are supported by specific Workspaces of Capture One CH, which when selected, sets the user interface to include only the needed functions.

Below are the default CH workspaces of Capture One CH:

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Daily preparation Admin: Check that the settings for the digitization workflow are optimal by confirming the Base Characteristics, showing the Mode, the ICC Profile and the Curve. An LCC profile for the day is generated, to secure that the captures are done with an even light distribution. The SG color target is shot, and exposure and white balance set. The SG color target is exported and verified with Delt.ae and/or with your “see-through” verification tool holding the exact color specification of your target.

Check the current resolution using the resolution ruler (only available in Capture One CH) with your target and adjust resolution and focus, if need be.

Daily production: With Admin in place, the digitization production of the day/shift consists of positioning the next original and then press the capture button. This can simply be repeated as required with no further changes to the settings.

Productivity “extras” Certain digitization projects need a confirmation on focus, resolution and color accuracy with every scan/capture. With Capture One CH such online verification procedures can be programmed to suit the individual purpose using the Apple Scripting capabilities of Capture One CH.

The synergy between Phase One Capture One CH and Digital Transitions reprographic solutions greatly enhance productivity. Many of the Digital Transition systems do not need to be refocused since the materials being imaged are always in the same focus plane.

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The specific needs for saving metadata with every scan is also a discipline that can be tailored to suit a given digitization project as a combination of the Capture One CH standard metadata tool and add-on using Apple Scripted procedures.

6.3. General Workflow

The general workflow for accurate color reproduction includes the following stages:

1. Lighting the scene a. Setup the lighting correctly (45 degrees, two lamps) b. Mask off any incoming reflections 2. Setting up Capture One CH a. Camera connect b. Naming next Capture c. Base Characteristics for accurate color workflow i. Mode: Photography ii. ICC Profile: (see point 4 below) iii. Curve: Linear Scientific iv. Engine: Capture One 8 3. Secure uniform distribution of light using the LCC tool of Capture One-CH 4. Select your ICC profile and shoot color target a. Ready made ICC profile from Capture One CH library i. Capture the target (Xrite ColorChecker SG) ii. Set the white balance iii. Set the correct exposure iv. Export as 16-bit TIFF for validation b. Your own pre-generated custom.ICC profile i. Capture the target (Xrite ColorChecker SG) ii. Set the white balance iii. Set the correct exposure iv. Export as 16-bit TIFF for validation Optional: Generation of an ICC-profile using 3rd party software (basICColor) c. Set CO CH ICC Profile to Phase One Effects No color correction d. Capture the target (Xrite ColorChecker SG) e. Set the White balance f. Set the correct exposure g. Export the cropped target as TIFF, 16-bit, Uncompressed h. Import the TIFF target into basICColor and generate ICC profile i. Save ICC-profile in correct location with correct name 5. Verify the color accuracy of the captured target a. Using Delt.ae web-site for online verification of FADGI and/or Metamorfoze compliance b. Using your own “see through” reference target (made from your specific target and the exact spectrophotometer readings of the colors) c. Optional: checking the captured color target using IQ-Analyzer from Image Engineering d. Optional: checking the captured color target using GoldenThread Analysis Software from Image Science Associates

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