Hello,
in the German scanner forum it was asked how to achieve device-independent
colours for scans of drawings / paintings.
I made a brief test with a drawing with colour pencils one of my
grandchildren did. I scanned it and then used an ICC-profile derived from a
reflectance target on Kodak film to render the scan. The colours that came
out were not correct. Presumably, since the target did not match the paper /
pencil combination.
Now I wonder, how to improve -- just out of curiosity. My idea is to draw a
target on the dedicated paper using these pencils, e.g. like the x-rite
color checker classic. One can use a spectrophotometer and measure the
reflectance spectra of the patches and calculate the XYZ- and Lab-values for
D50 using the formulae given e.g. by Bruce Lindbloom. So one could create a
reference table for this "target" and scan the "target".
But how would one then proceed with Argyll, since scanin will most likely
not recognize the hand-made target fields? I could manually measure the R,
G, and B-values and their standard deviation of the patches with imageJ and
edit a ti3-file. Would that be it?
Many thanks in advance and best wishes
Hermann-Josef
