Keep in mind that color is not an absolute when photographed. so much is dependent on lighting. The strength, spectrum and tint of the lights on a object determines the color of an object.  This is what I was taught in a college course on color theory.  So finding the "right" color means very careful techniques to capture that color. This is probably why there is such a high price for measuring devices and software.

Boni

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"Be Hero to Yourself" -- Peter Tork