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GMG Colorserver Tutorial: Creating a New MX4 Color Profile

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GMG Colorserver Tutorial: Creating a New MX4 Color Profile Tutorial GMG ColorServer Profile Editor Creation of New MX4 Conversion or Separation Profiles © 2006–2007 GMG GmbH & Co. KG GMG GmbH & Co. KG Moempelgarder Weg 10 72072 Tuebingen Germany This documentation and described products are subject to change without notice. GMG GmbH & Co. KG makes no guaranty as to the accuracy of any and all information and procedures described in this documentation. To the maximum extent permitted by applicable law, in no event shall GMG GmbH & Co. KG or the author be liable for any special, incidental, direct, indirect, or consequential damages whatsoever (including, without limitation, injuries, damages for data loss, loss of business profits, business interruption, loss of business information, or any other pecuniary loss) arising out of the use of or inability to use the software or this documentation or the provision of or failure to provide Support Services, even if GMG GmbH & Co. KG has been advised of the possibility of such damages. Reprinting and copying, as well as other duplication including excerpts of this document, are prohibited without the written permission of GMG GmbH & Co. KG. This also applies to electronic copies. GMG, the GMG Logo, and GMG product names and logos are either registered trademarks or trademarks owned by GMG GmbH & Co. KG. All brand names and trademarks are the property of the respective owner and are expressly recognized as such. If brand names, trademarks, or other material are used without the permission of the respective owners, we request appropriate notification. We will immediately stop use of said items. PANTONE® colors displayed in the software application or in the user documentation may not match PANTONE identified standards. Consult current PANTONE color publications for accurate color. PANTONE®, PANTONE® Goe™ and other Pantone, Inc. trademarks are the property of Pantone, Inc., © Pantone, Inc., 2007. Pantone, Inc. is the copyright owner of color data and/or software which are licensed to GMG GmbH & Co. KG to distribute for use only in combination with GMG ColorProof, GMG DotProof® and GMG FlexoProof. PANTONE color data and/or software shall not be copied onto another medium or hard disk unless as part of the distribution of GMG ColorProof, GMG DotProof® and GMG ColorProof. Microsoft and Windows are registered trademarks of Microsoft Corporation in the United States and/or other countries. X-Rite is a registered trademark of X-Rite, Incorporated. Logo CMM is a registered trademark of X-Rite, Incorporated. HP, Hewlett-Packard, and Designjet are registered trademarks of Hewlett-Packard Company. Epson, Epson Stylus, and Epson Stylus Pro are registered trademarks of Seiko Epson Corporation. UltraChrome is a trademark of Epson America, Inc. Nexus is a trademark of Artwork Systems N.V. Adobe and Photoshop are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries. Canon is a registered trademark of Canon Inc. Last update of this documentation: 08/10/2007 This documentation refers to the GMG software build No. 4.5.1 * Special notes: The following forms of typographic emphasis are used to give this Tutorial a clear and informal structure: Emphasis Function Emphasizes a particular software Text in Courier New directory, a path, or a folder. Emphasizes particular software tabs, menus, keys, icons, selection Italic text boxes, instructions, commands, and other software elements. "Text in quotation Used to emphasize exemplary marks" files and settings. Indicates important information, * notes and warnings. Contents 1. Introduction.................................................................... 6 1.1. MX4 color profile types .................................................... 6 1.2. Structure of an MX4 color profile........................................ 8 1.3. Functions of the different MX4 profiles ............................... 12 1.3.1. CMYK conversion profiles............................................... 13 1.3.2. CMYK reseparation profiles ............................................ 13 1.3.3. RGB separation profiles.................................................. 14 1.3.4. RGB conversion profiles ................................................. 14 1.4. Control of profile calculation ........................................... 15 1.4.1. Separation settings ........................................................ 15 1.4.2. Gamut Mapping........................................................... 18 1.5. Special case: CMYK MX3 profile .................................... 23 1.6. Schematic representation of profile creation........................ 23 2. Creating a CMYK conversion profile................................. 25 2.1. Defining the source and target color spaces ....................... 25 2.1.1. Importing the characterization file ..................................... 29 2.1.2. Importing an ICC profile................................................. 30 2.1.3. Creating a Gamut File ................................................... 32 2.2. Keep Separation mode .................................................. 33 2.3. Adapt Separation mode ................................................. 42 2.4. Create new Separation mode ......................................... 47 2.4.1. Keep Black.................................................................. 50 2.4.2. CMYK reseparation profiles ............................................ 56 2.5. Paper tint correction....................................................... 61 2.6. Creating an MX3 conversion profile ................................. 66 3. Creating an RGB separation profile .................................. 71 3.1. Basic settings ............................................................... 71 3.2. Structure of an RGB profile.............................................. 76 4. Calculation with Gamut Mapping .................................... 81 4.1. Clip/Perceptual Gamut Mapping control........................... 82 4.2. Enhance Contrast Gamut Mapping control......................... 84 4.3. Neutralize Gray Gamut Mapping control .......................... 86 4.4. Other Gamut Mapping settings........................................ 88 5. Additional functions ....................................................... 89 5.1. User-defined separation settings ....................................... 89 5.1.1. Reducing the total ink application..................................... 89 5.1.2. Changing the Black Ink Limit............................................ 91 5.1.3. Changing the Black Start ................................................ 93 5.1.4. Changing the Black Width ............................................. 96 5.1.5. UCR settings ................................................................ 99 5.2. Visual checking of the color profiles ................................ 106 5.2.1. Checking the separation settings .................................... 106 5.2.2. Checking the color conversion....................................... 108 5.3. Additional ICC import functions...................................... 109 5.3.1. Import of Lab transformation values ................................. 109 5.3.2. Import of CMYK values ................................................ 110 5.4. Interpolating target values / Estimating from CMYK ........... 111 5.5. Measuring in the GMG ColorServer Profile Editor.............. 112 5.6. Optional optimization of the color profile ......................... 115 5.6.1. Iterative colorimetric optimization.................................... 115 5.6.2. Visual optimization ...................................................... 120 5.7. Protect Profile function .................................................. 127 5.8. Glossary ................................................................... 128 1. Introduction Standardization, flexibility, media-neutral data storage, and multiple utili- zation are topics that today's almost totally digitized prepress sector has to deal with in order to survive the tough competition. The logical conclu- sion to be drawn is, of course, the automation of processes and work- flows. For example, when it comes to preparing a file for different printing conditions, automatic color space conversion offers enormous savings po- tential. In addition, the creation of today's printing standards (e.g. ISO standards) enables us to work and communicate on a common basis. Using GMG ColorServer, fully automated color space conversions can be performed using hotfolder technology. These conversions are defined by GMG's MX4 color profiles. This Tutorial guides you through the pro- cess for creating an MX4 color profile with the new GMG ColorServer Profile Editor. Profiles for color transformations between most standard color spaces are included in the delivery of GMG ColorServer. New pro- files are published regularly in the Support area at www.gmgcolor.com and can be downloaded there. 1.1. MX4 color profile types MX4 color profiles contain all the information needed for conversion be- tween two color spaces. GMG works with a variety of MX4 color profile types. Proof output is defined by MX4 CMYK proofing profiles, on the basis of which the colors are converted for the specific proof output in question. The input data is not changed in this context. Page 6 New MX4 Profile In GMG ColorServer, the automatic color space transformations are con- trolled via MX4 conversion or separation profiles. The color values in the file that is processed are converted. Therefor the
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