Re: Adjusting colors to match a color guide ...
In theory, you can accomplish this via info points on the relevant colors.
Set them to HSB mode, and use curves to adjust them to the appropriate hue
angles, zero for red, 240 for blue, etc. This will probably be of limited
usefulness because the hues of the patches are probably not accurately
known.
You may get more accuracy by getting nominal Lab values for the control
patches, and using curves to match them as best you can. This is called
color pinning in Curvemeister, and can be used to good effect, provided you
are aware of the limitations. If Kodak does not publish these values,
perhaps you can use a spectrophotometer to measure the Lab color values of
the original card, if it is available. Focus on an accurate match for the
light red, red, and light blue patches, since these are the colors that
appear in the image.
A lot can be done without having accurate Lab values for the patches. I
would use curves (what else?) to remove the overall yellow-green cast from
the image, make sure that black and white colors span the entire range, and
use a gradient layer mask and an adjustment layer to correct the uneven
lighting of the original.
Since this appears to be a hand tinted engraving, or color block print, I
would not concern myself so much with color fidelity, as with having a
reasonably natural skin tone, and a brighter look to the colors. The
original artist was, after all, not able to achieve an accurate rendering of
the subject, since he was limited by whatever pigments were used for the
original colors.
--
Mike Russell
www.curvemeister.com/forum/
Mike Russell
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