Press Matcher Web User Manual - image2output - Support

Fine Tuning
Step 7: Manual Fine Tuning
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Note: Most important is a good match of chroma (delta Cab) and hue (delta
Hab), which is often achieved at the expense of luminance (delta L).
4. If required, optimize the corrected color using the sliders on the righthand
side. Alternatively, type the new CMYK values into the input
boxes displayed next to these sliders.
The amount by which you have changed the corrected color is displayed
in the gray boxes underneath CORRECTION.
5. To visually evaluate the color deviation, click on the GRAPH button in
the top right dialog area. The color deviation is now displayed graphically
as the distance between two crosses or lines, respectively.
The circle represents the color values on the a and b axes of the Lab
color space, allowing you to evaluate the match in hue. The color bar
to the right of the circle represents the L axis and allows you to evaluate
the match in brightness. The other bars allow you to evaluate
the match in chroma (delta Cab) and hue (delta Hab).
When correcting the color match using the sliders on the right (see
above), try to move the colored cross on top of the black cross representing
the color to be matched. Also try to move the colored lines
on top of the black lines.
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