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NNikonikon CCoolorlor MManagementanagement KKeepingeeping CCoolorslors TTruerue The Nikon Management System, or Nikon CMS, en- Nikon CMS involves two categories of preferences, one sures that image data from Nikon scanners are repro duced (“”) for use when Nikon CMS is off and the other consistently and accurately on monitors or printers. With this (“Color Manage ment”) for use when Nikon CMS is on. pow er ful tool, can be manipulated in a cal ibrat ed RGB “Gamma” specifi es how data from the scanner will be mod- before the data are passed to the host applica- i fi ed for display on the monitor. Because monitor profi les tion. Profi les detailing the color char ac teris tics of the chosen can not be used when Nikon CMS is off, this adjustment color model and the output de vice (mon itor or print er) en- must be made manually. “” is used to sure that colors will be reproduced ac cu rate ly in al most any turn Nikon CMS on and off and select the profi les for use operating environment. with the monitor and with the CMYK and calibrated RGB color models when Nikon CMS is on.

TTurningurning NikoNikon CCMSMS OOffff In general, much better results can be achieved with Nikon CMS on. It may however be necessary to turn color management off to: • Speed processing If the computer has a slow CPU, the processing required for color management may result in longer scan times. Try turning color man- CCMYKMYK agement off for reduced scan times. Images can not be scanned in CMYK. If CMYK data are required, con- vert images to CMYK before saving them to disk. Note that images • Edit data from the scanner directly can only be saved in CMYK if Nikon CMS is on (Nikon CMS is on by Advanced users may want to turn Nikon CMS off to edit uncalibrated default). RGB data from the scanner.

Preferences— Nikon Color Management TOP 78 How Nikon CMS Works When image data are passed from an input device, such as Color-Space Profi les a scanner, to an , such as a monitor or , Separate profi les are available for the RGB and CMYK color color management ensures that the image displayed on the models. Nikon Scan comes with a selection of profi les for output device “looks the same” as the original. To accom- the RGB color model, while CMYK profi les for color print ers plish this task, the color management system must have are usually provid ed by the manu factur er. Color-space pro- information about the color characteristics of both the input fi les are used when editing images in the scan window and and output devices, as well as the used for edit- when making the fi nal scan. ing. The fi les containing this in for ma tion are called “ICC pro- Monitor Profi les fi les.” Nikon Scan uses the follow ing three types of profi le: Monitor profi les are usually provided by the manufacturer, Input Profi les although profi les for some common monitor types may be Input profi les provide information on the input device, i.e., included with the computer operating system. Monitor the Nikon scanner. Fixed profi les de tailing the color char- profi les apply when images are displayed on a monitor, for ac ter istics of support ed Nikon scanners are provided with example when an image is displayed in the preview area or Nikon Scan. An input profi le is se lect ed auto mat i cal ly based an image window. on the model of scanner used and the type of media (pos- itive or ) being scanned.

CCreatingreating MMonitoronitor PProfirofi lleses If desired, can be used to create a monitor profi le for a specifi c environment. This profi le can then be used in Nikon Scan. For information on creating monitor profi les, see the doc umen ta tion provided with Adobe Photoshop. This option is not avail able in Adobe Photoshop LE.

Preferences— Nikon Color Management TOP 79 The Scanning Process When the Scan button is clicked to perform the fi nal scan, The illustration below shows the role Nikon CMS plays in the scan data are processed according to the selected color- the scanning process. CMS profi les are shown in , user space profi le and any changes that were made using the op era tions in . color en hance ment and Unsharp Mask tools in the scan win dow. The data are then trans ferred to the host ap pli- When Nikon CMS is on, uncalibrated RGB image data from ca tion. Where possi ble, the color-space pro fi le is transferred the scan ner are converted to or calibrated RGB, to the host ap pli ca tion to geth er with the image data. The de pending on the color model selected in the scan window. TWAIN in ter face used in Windows, how ev er, does not al low RGB data are processed according to the profi le selected for profi les to be passed to an oth er ap pli cation, with the result the calibrated RGB color space. These data are stored in that under Windows the profi le is only transferred to the mem ory so that the color model can be changed with out host when Nikon Scan is used as a “stand-alone” application per form ing anoth er preview. Any changes made using the (note that profi le information is lost when the image is saved color enhancement and Unsharp Mask tools also ap ply to in a format such as BMP that does not allow the profi le to these data. When the image is dis played in the pre view win- be recorded). When imag es are dis played in im age win dows dow, the moni tor pro fi le is used to ensure that the preview in Nikon Scan, the monitor profi le ensures that the image on image is as true as pos si ble to the data in mem ory. the screen refl ects the orig i nal as close ly as possi ble.

Before preview Preview Image processing Scan Host application Scanner Extras Preview Curves Monitor Scan Digital ICE4 Advanced Processed tab profi le Scan Image Enhancer LCH Editor Analog Gain Unsharp Mask

Scanner Color-space New color- input profi le profi le space profi le

Film type selection Changes to color Monitor Color model and profi le model or color- Natural tab profi le selection space profi le

Preferences— Nikon Color Management TOP 80 Scanning with Nikon CMS Off The illustration below shows how scanning proceeds when If Use Nikon Color Management System is not selected in Nikon CMS is off. The image shown in the preview window the “Color Management” category, profi les can not be used is adjust ed for display in the monitor accord ing to the value to ensure that the data from the scanner are reproduced ac- cho sen for preview gamma in the “Gam ma” category. When cu rately when passed to another application or displayed in the Scan but ton is clicked, the main scan gamma and any the mon itor. Be cause the color profi les required for a cali - changes to curves and color balance are passed to the scan- brated RGB color space are not available when Nikon CMS is ner, where they are ap plied to scan data be fore the image is off, images can only be scanned as uncalibrated RGB or gray- trans ferred to the host ap pli ca tion (if Nikon Scan is used as scale. Similarly, the absence of a monitor profi le means that a “stand-alone” ap pli ca tion, the value for preview gam ma gamma adjustment must be used to correct the image for is passed to the scan ner instead of main scan gamma). The display on the monitor or for editing in another application. LCH Editor and Unsharp Mask tools can not be used when These ad just ments to gamma are made in the “Gamma” Nikon CMS is off. category of the “Prefer enc es” dialog.

Before preview Preview Image processing Scan Host application Scanner Extras Preview Curves Preview Scan Digital ICE4 Advanced Processed tab Color Balance gamma Scan Image Enhancer Analog Gain Main scan gamma

Preview Gamma adjustment Natural tab gamma

Preferences— Nikon Color Management TOP 81 Gamma When the Use Nikon Color Management System option Preview gamma in the “Color Management” category ( 84) is off, the con- Preview gamma applies to the image displayed in the pre- trols in the “Gamma” category are used to adjust data from view area of the scan window. In general, preview gamma the scanner so that they display correctly when previewed on is solely for display in the preview area and does not apply the monitor or opened in anoth er application. to the image data that are passed to the host application when the Scan button is clicked. There are two exceptions to this rule, how ev er. The fi rst is when Nikon Scan is used as a “stand-alone” application, the second when Use preview gamma is se lected as the main scan gamma option. In these cases preview gam ma is ap plied to im age data passed to the host ap pli ca tion.

Preview gamma de faults to a val ue of 1.8 on the Macintosh, 2.2 on Win dows com puters. To choose a ting suited to the current monitor, adjust the value so that the pat terns of gray lines and dots above the slider match in density. Gam- ma can be set by en ter ing a value directly into the text box or by moving the slider. When mak ing this ad just ment, set the res olu tion on the monitor to a low value such as 640 × 480 and sit as far away from the monitor as possible. To restore the default setting for your platform, click Reset.

Preferences— Nikon Color Management TOP 82 Main scan gamma Use application gamma Main scan gamma options are only In some environments, a value for gamma can be chosen visible when Nikon Scan is being in the host application and passed to the Nikon Scan plug- used as a TWAIN source or acquire in. When Use application gamma is selected, this value is plug-in for anoth er program (when applied to the main scan data before they are passed to the Nikon Scan is used as a “stand- host application. alone” application, preview gamma automatically applies Two conditions must be fulfi lled if this option is to be ef fec - both to the preview image and to the fi nal scan). Image data tive. First, the inter face be tween the ap pli ca tion and Nikon passed to the host application are modifi ed according to the Scan must allow the gamma value to be passed to the Nikon option chosen here. Three op tions are available: Scan plug-in. The TWAIN inter face used under Windows Use preview gamma does not, however, allow the gamma value to be passed to The gamma value chosen for preview gamma is applied be- the TWAIN source (i.e., to Nikon Scan). Con se quently, in the fore the data are passed to the host application. Use this Windows ver sion of Nikon Scan a default val ue of 2.2 is used setting when the host application does not support in de - for main scan gamma when ev er Use appli cation gam ma pendent gamma settings and you want the fi nal image to be is se lected. Second, the appli ca tion must support gamma modifi ed for display on your monitor. transfer. If Use appli cation gam ma is se lect ed with a Macintosh ap pli ca tion that does not sup port this fea ture, Macintosh system gamma (1.8) will be used. Use custom gamma When this option is selected, a value for main scan gam ma can be en tered in the text box.

Preferences— Nikon Color Management TOP 83 Color Management The profi les used by the Nikon Color Management System Use Nikon Color Management System are specifi ed in the “Color Man agement” category. This option turns the Nikon Color Management System on and off. Changes to this setting only take effect after Nikon Scan has been quit and restarted. When Nikon CMS Is On… …images are processed to ensure consistent color re pro- duc tion, as described in “How Nikon CMS Works” ( 79). Because color management profi les typically contain their own settings for gamma, the controls in the Gamma tab are dimmed and inactive. When Nikon CMS Is Off… …monitor and color-space profi les are not used, and the con trols in the Color Management tab are dimmed and in- ac tive. The only tool available for ensuring that colors from the scan ner will be displayed accurately on the monitor is the “Gamma” category ( 82). The only adjustments made to the image be fore it is passed to the host application are gamma ad justment and changes to curves and color balance made in the scan window.

Preferences— Nikon Color Management TOP 84 The “Monitor” Tab Use factory default monitor profi le (default) The “Monitor” tab specifi es the profi le that will be used Nikon Scan is supplied with default monitor profi les for use when images are displayed on your monitor, either in the when no other profi le is available (see below). To use the scan window preview area or a Nikon Scan image window. default pro fi le for your plat form, select Use factory default Monitor profi les contain information about the color and mon i tor pro fi le. gamma characteristics of the monitor, allowing images to be Default Windows Monitor Profi le (Gamma 2.2) ad just ed for more accurate color reproduction. The default Windows monitor profi le (“NkMonitor_Win.icm”) is identical to the sRGB profi le. Default Macintosh Monitor Profi le (Gamma 1.8) The default Macintosh monitor profi le (“NkMonitor_ Mac.icm”) is iden ti cal to the profi le used for Apple 17˝ moni-

tors with a D50 point. Use custom monitor profi le Use this option to select a profi le supplied by the company that manufactured the monitor. When this option is se- lect ed, the Choose Custom Profi le… button will be active. Click ing this button dis plays a standard “open fi le” di a log; nav i gate to the disk and folder containing the man u factur er’s profi le. The path to the selected profi le will appear in the text box below the Use custom moni tor profi le radio but- ton.

Preferences— Nikon Color Management TOP 85 The “RGB” Tab Each of the pro fi les listed may be classifi ed according to its The “RGB” tab is used to select a color-space profi le for the gamma value and . Gamma is a fundamental char- cal ibrat ed RGB color model. The profi le used can be se lect ed ac ter istic of im ag ing systems which determines the intensity from the Color space menu. of the output sig nal relative to the input; in human terms, gamma controls the subjective brightness of images through alter ations to the out put level for mid-tones. Win dows and Macintosh systems pro cess signals differ ently, and these differences are re fl ect ed in the difference in the standard gam ma values for these plat forms. The default system gamma for Macintosh computers is 1.8, the de facto standard for Win dows systems, 2.2. Nikon CMS includes eight RGB pro fi les with a Windows gamma of 2.2 (sRGB, Bruce RGB, NTSC [1953], Adobe RGB [1988], CIE RGB, Wide Gamut RGB, compensated Wide Gamut RGB, and Scanner RGB), and three profi les with a gamma val ue of 1.8 (Apple RGB, ColorMatch RGB, and compensated Apple RGB), for use on the Macintosh. When scan ning imag es, choose a profi le with a gamma value suited to the sys tem on which the image will be edited.

Preferences— Nikon Color Management TOP 86 The “CMYK” Tab Use factory default CMYK profi le (default) The CMYK sheet is used to select a profi le for use with the Nikon Scan is supplied with a default CMYK profi le (the CMYK color model. SWOP color library) for use when no other profi le is avail- able. This profi le is used when Use factory default CMYK profi le is se lect ed. Use custom profi le Use this option to select a profi le supplied by the company that manufactured your printer. When this option is se lect ed, the Choose Custom Profi le… button will be active. Click- ing this button displays a standard open-fi le dialog; nav igate to the disk and folder contain ing the manu fac tur er’s pro fi le. The path to the se lect ed profi le will appear in the text box below the Use custom CMYK profi le ra dio but ton.

CCMYKMYK Images can not be scanned in CMYK. If CMYK data are required, con- vert images to CMYK before saving them to disk. Note that images can only be saved in CMYK if Nikon CMS is on (Nikon CMS is on by default).

Preferences— Nikon Color Management TOP 87 RGB Profi les Provided with Nikon Scan NTSC (1953) This is the color space for video defi ned by the National Windows Profi les (Gamma 2.2) Tele vi sion Standards Committee (NTSC) in 1953 and used in sRGB early color televisions. This color space is also used in some This RGB profi le is used in the majority of Windows mon- Far-East newspaper and printing organizations. The cor re- itors. It closely resem bles the RGB commonly used in color spond ing RGB set ting in Photoshop 5.0 is “NTSC (1953).” tele vi sion, and is also used in the digital tele vi sion broad- casting sys tem that is on its way to becoming the industry Adobe RGB (1988) standard in the United States of Amer i ca. Soft ware and A color-space profi le defi ned in Photoshop 5.0. It has a hardware manu factur ers use it as a default color profi le and wider gamut than sRGB and includes the colors found in guarantee operation when it used. It is also on its way to most CMYK , making it suitable for users involved in becom ing the standard for images on the web. This profi le desktop publish ing. The corresponding RGB setting in Pho- is suited to users who plan to use their digital images “as is,” toshop 5.0 is “Ado be RGB (1988).” without editing or printing them. It however suffers from CIE RGB the draw back of a narrow gamut with a limited area avail- A video color-space profi le established by the CIE. While able for re pro duc ing . The cor re spond ing RGB setting it boasts a fairly wide gamut, it suffers from the drawback in Photoshop 5.0 is “sRGB.” that the area de voted to the repro duc tion of is relatively Bruce RGB small. The cor re spond ing RGB setting in Photoshop 5.0 is This color profi le attempts to expand on the ColorMatch “CIE RGB.” RGB gamut by de fi n ing the for G as lying be- Wide Gamut RGB tween the values for G in the Adobe RGB and ColorMatch This color-space profi le, designed by Adobe, incor po rates color-space pro fi les. It was pro posed by Bruce Fraser, who most of the visible colors. This however has the conse quence claims that it includes most of the colors in the SWOP CMYK that most of the colors it can express can not be reproduced gamut. It is not provided in the standard install of Photoshop on standard moni tors and print ers. The corresponding RGB 5.0, but can be selected as the RGB color-space profi le for set ting in Photoshop 5.0 is “Wide Gamut RGB.” Photoshop by import ing the profi le “NkBruce.icm”.

Preferences— Nikon Color Management TOP 88 Wide Gamut RGB (compensated) Scanner RGB Nikon scanners can scan some colors that cannot be ex- This profi le replicates the color space achieved when scanning pressed using the Wide Gamut RGB color-space profi le. with Nikon CMS off. Its main purpose is to allow the LCH The com pen sat ed Wide Gamut RGB profi le redefi nes Wide ed itor and Unsharp Mask tools, which are not available when Gamut RGB to include all the colors that can be output from Nikon CMS is off, to be used to edit the colors produced by the scanner. Be cause many of the colors that can not be ex- the scan ner. In order to pro duce the effect achieved by turn- pressed in Wide Gamut RGB occur in the blue portion of the ing Nikon CMS off, the moni tor profi le is not used, nor is an gamut, the level of detail in the blue area has been greatly ICC profi le included with the image when it is opened in the increased (because the gamut has been expanded in a non- host ap pli ca tion. linear fash ion to in cor po rate just those colors that could not otherwise be ex pressed, it can not be rep re sent ed in chro- matic ity dia grams using a stan dard RGB triangle). As is the case with Wide Gamut RGB, most of the colors defi ned in this profi le can not be repro duced on moni tors and print- ers. It is output to the host ap pli ca tion as Wide Gamut RGB. When scanning images into Photoshop 5.0 using this profi le, set the Photoshop RGB profi le to “Wide Gamut RGB.”

Preferences— Nikon Color Management TOP 89 Macintosh Profi les (Gamma 1.8) Apple RGB (compensated) Apple RGB This profi le defi nes tristimulus (red, , and blue) chro ma - This profi le is used in desk-top publishing applications and tic ity as the intersection of the curve that marks the limits of in Adobe Photoshop versions 4.0 or earlier, and is the typical the visible gamut with lines drawn from the Apple RGB white RGB profi le for Macintosh monitors. The corresponding RGB point and pass ing through the points that defi ne tristimulus set ting in Photoshop 5.0 is “Apple RGB.” This profi le is suit- chro matic ity in the Apple RGB color-space profi le. This pro- able for working with images dis played on the Macintosh. fi le is unique in that it preserves the characteristics of Apple RGB while al lowing more sat u rated colors. It is not pro vided ColorMatch RGB in the standard install of Photoshop 5.0, but can be selected The ColorMatch profi le is native to Radius PressView mon- as the RGB color-space profi le for Photoshop by import ing itors. It has a wider gamut than Apple RGB, with a par tic u- the profi le “NKApple_CPS.icm”. larly wide area devoted to the reproduction of blues. The cor re spond ing RGB setting in Photoshop 5.0 is “Color Match RGB.”

Preferences— Nikon Color Management TOP 90 “Gamut” No color profi le is capable of expressing the full range of col- In addition to gamma, profi les can be classifi ed according to ors visible to the . The diagram below com pares their gamut, or the range of colors that can be ex pressed us- the gamut of col ors vis ible to the eye with the colors that can ing the profi le. Gamut is conventionally expressed by means be ex pressed in each of the RGB profi les pro vid ed with Nikon of chromaticity, a measure of color developed by the Com- CMS. The gamut for each profi le is contained in the triangle mission Internationale de l’Éclairage (CIE). The CIE system, defi ned by the three points that mark the extremes of red, which is modeled on hu man color , maps the green, and blue for that profi le (red is at the bot tom right physical of light to three coordinates (known corner, green at the top of the triangle, and blue at the bot- as CIE X, Y, and Z) that give unique nu mer i cal expres sion tom left corner). The for each profi le is shown to the full range of color differences that can be per ceived by the symbol in the cen ter of the triangle. by hu mans. Chroma tic ity is a mea sure of col or from which con sid er ations of bright ness have been fac tored out, giving y 1 a two-co ordi nate system. Apple RGB 0.9 Color Match RGB In the chromaticity diagram at right, the complete gamut of 0.8 sRGB col ors visible to hu mans is in the area enclosed by the green 0.7 NTSC (1953) line. The curved portion of the line gives the chroma tic ity Bruce RGB 0.6 of “pure,” un mixed colors with wavelengths in the visible Adobe RGB (1988) 0.5 spec trum of 380–780 nm. The blue end of the spectrum CIE RGB (380 nm) is at the bot tom left corner, the red end of the 0.4 Wide Gamut RGB Human spectrum (780 nm) at the bot tom right corner. The straight 0.3 diagonal line connect ing these two points rep re sents the dif- 0.2 fer ent shades of creat ed by combining red and blue 0.1 light. The colors inside the area en closed by these lines are created by mixing light of dif fer ent wavelengths. 0 x 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Preferences— Nikon Color Management TOP 91 The following table shows the gamma values for the profi les included with Nikon CMS, together with the chroma tic ity val- ues for the white point and for red, green, and blue. White Point Gamma Chromaticity (x, y) Profi le Name Value Value Name R G B x 0.3127159 x 0.64 x 0.3 x 0.15 sRGB 6500K (D65) 2.2 HDTV (CCIR 709) y 0.3290015 y 0.33 y 0.6 y 0.06 x 0.3101 x 0.67 x 0.21 x 0.14 NTSC (1953) Std Illuminant C 2.2 NTSC (1953) y 0.3162 y 0.33 y 0.71 y 0.08 x 0.3127159 x 0.64 x 0.28 x 0.15 Bruce RGB 6500K (D65) 2.2 Bruce RGB y 0.3290015 y 0.33 y 0.65 y 0.06 x 0.3127159 Adobe RGB x 0.64 x 0.21 x 0.15 Adobe RGB (1988) 6500K (D65) 2.2 y 0.3290015 (1988) y 0.33 y 0.71 y 0.06 x 0.3333333 x 0.735 x 0.274 x 0.167 CIE RGB Std Illuminant E 2.2 CIE RGB y 0.3333333 y 0.265 y 0.717 y 0.009 x 0.3457029 x 0.7347 x 0.1152 x 0.1566 Wide Gamut RGB 5000K (D50 ) 2.2 700/525/450nm y 0.3585386 y 0.2653 y 0.8264 y 0.0177 x 0.3127159 x 0.625 x 0.28 x 0.155 Apple RGB 6500K (D65) 1.8 Trinitron y 0.3290015 y 0.34 y 0.595 y 0.07 x 0.3457029 x 0.63 x 0.295 x 0.155 ColorMatch RGB 5000K (D50 ) 1.8 P22-EBU y 0.3585386 y 0.34 y 0.605 y 0.077 x 0.3127159 x 0.65 x 0.265 x 0.14 Apple RGB (Compen sat ed) 6500K (D65) 1.8 Custom y 0.3290015 y 0.341 y 0.717 y 0.0454 x 0.3127159 x 0.64 x 0.3 x 0.15 Default Windows Monitor 6500K (D ) 2.2 HDTV (CCIR 709) 65 y 0.3290015 y 0.33 y 0.6 y 0.06 x 0.34570291 x 0.625 x 0.28 x 0.155 Default Macintosh Monitor 5000K (D ) 1.8 Trinitron 50 y 0.3585386 y 0.34 y 0.595 y 0.07

Preferences— Nikon Color Management TOP 92 KKeepingeeping ColoColorsrs TTruerue iinn OOttherher AApplicationspplications When Nikon Scan is used as an acquire plug-in to the Macintosh version When an image is scanned in the Nikon Scan TWAIN source or acquire of Adobe Photoshop 5 or later (full version), the RGB profi le will auto- plug-in and opened in another application, or when an image saved matically be passed to Photoshop when the image is scanned. Be sure using Nikon Scan is opened in another application, the image will be that the monitor profi le matches that used in Photoshop by selecting the pro cessed ac cord ing to the col or-space and monitor profi les se lect ed in Photoshop monitor profi le in the monitor sheet of the Nikon Scan color the application before being displayed on the monitor. If the pro fi les management tab. used in the ap plica tion do not match those used in Nikon Scan, col ors CMYK Color Model may not be the same as those in the original image. Choose a monitor pro fi le that match es that cho sen in the monitor sheet RGB Color Model and a color-space profi le that match es that se lect ed in the CMYK sheet. Choose a monitor pro fi le that match es that cho sen in the “Monitor” When Nikon Scan is used as an acquire plug-in to the Macintosh ver- tab and a color-space pro fi le that match es that se lect ed in the “RGB” sion of Adobe Photoshop 5 or later (full version), the CMYK profi le will tab (the Photoshop pro fi les cor re spond ing to those used in Nikon Scan automatically be passed to Photoshop when the image is scanned. are list ed on the preceding pages). If no matching RGB profi le exists, you can use the Nikon Scan profi les in the path Pro gram Files\Common Files\Nikon\Profi les (Win dows) or System Folder : Prefer enc es : Nikon MAID : Profi les (Macintosh). The fi les containing the profi les listed in the RGB sheet are given below. Profi le File name sRGB NKsRGB.icm Bruce RGB NKBruce.icm NTSC (1953) NKNTSC.icm Adobe RGB (1998) NKAdobe.icm CIE RGB NKCIE.icm Wide Gamut RGB NKWide.icm Apple RGB NKApple.icm Color Match RGB NKMatch.icm Apple RGB (compensated) NKApple_CPS.icm * Do not use the “Scanner RGB” profi le when scanning images for use in a third-party application.

Preferences— Nikon Color Management TOP 93