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Imatest Documentation management tab. Click Add... then select the custom profile. (A lotta steps!) Target: contains the output profile for the scan. Adobe RGB is recommended in most cases because its gamut exceeds that of most high quality printers: sRGB (the default) may not be sufficient. Make sure to select the same Color space for the scanner in the Print test input dialog box. Note: this profile is not embedded in the scanner output. This is a deficiency in the Epson scanner software: almost a bug (though a common bug; it appears in many cameras and raw converters.). You need to remember the profile and embed it in the file without changing the image data. See Assigning a profile, above. Is the scanner gamut large enough? The default color space of the Epson 3200 scanner (for reflected images) is shown on the right. Its gamut is larger than sRGB and Adobe RGB (1998), shown below. The images are from Profile inspector, a nice little free program downloadable from Color.org, the official site of the ICC (the committee that gives us color management and all that). It's not the most convenient program— I had to combine the R, G, B, and White points. But it does the job. The scanner and Adobe RGB (1998) should cover the gamuts of most high quality printers. Scanner color response: Because Print test results are filtered by the scanner's color response, it's a good idea to verify it using Colorcheck. The response of the Epson 3200 with Epson's default ICC profile, shown below, is very good; comparable to the best digital cameras. For the best accuracy you should profile your scanner using one of several available software packages. 404 of 451
Imatest Documentation Scanner profiling on a budget from Photographical.net has a nice introduction to the process. Part 2 describes a promising free program called IPhotoMinusICC. (I has lots of poorly-documented options. I tried it and didn't get good results. I didn't take the time to figure out where I went wrong.) There are also several commercial programs of interest: Profile Mechanic - Scanner from the creators of my favorite image editor, Picture Window Pro. Works with IT8, GretagMacbeth ColorChecker, and other charts. Profile Prism MonacoEZColor Run Imatest. Select the Print test module. Crop the image so a small white border appears around the test pattern. If you scanned a Q-13 chart beside the test chart, be sure to omit it from the crop. After you've cropped the image, the Print test input dialog box, shown below, opens. Help opens a browser window containing a web page describing the module. The browser window sometimes opens behind other windows; you may need to check if it doesn't pop right up. Two color spaces, both of which default to sRGB, need to be entered manually because Print test does not recognize embedded ICC profiles. (And many scanners don't bother to embed them in their output.) 1. 2. Specify the (original) working color space used to print the target. This space is used in the La*b* plots below to generate curves representing the color space for various L (lightness) and S (saturation) levels. These lines are used to compare the actual and ideal color responses. Specify the color space used for the scanner output. In the Epson 3200, it is specified Configuration... dialog box, described above. The two checkboxes in the Plot box select figures to display. (La*b* plots are always displayed.) The HSL contour plots, illustrated below, are derived from RGB values whose meaning is dependent on the color space. They are highly detailed, but lack the absolute color information contained in the La*b* plots. The CIE xy plot is a CIE 1931 chromaticity plot of the gamut (for L = 0.5, S = 0 to 1 in steps of 0.2, and 0 ≤ H ≤ 1). It is familiar, but less readable and less perceptually uniform than the La*b* plot. Print Test results are filtered by the color space of the scanned file. The Windows default is sRGB, which has a limited gamut. For best results you should scan to a color space with a larger gamut— comparable to your printer. I recommend Adobe RGB (1998). 405 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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