I've noticed that GNU Ocrad 0.14 implements reading of color images and
looked at the code (without testing it). You seem to use the formula
greyvalue = min(red, green, blue)
which does not at all work like the human eye.
You are right in that it does not at all work like the human eye, but I
tried several formulas and this gave the best results for detecting
color letters on a white background. Your formulas seem to give better
results for images of real objects.
Of course I am willing to change the formula as soon as I have proof
that some other works better.
Best regards,
Antonio.
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