Sample metamerism: This is where the color appears different under different lighting conditions. The truck door color may have matched the rest of the truck under artificial light when it was painted but no longer did under sunlight.
Observer metamerism: This has happened even in this class, where someone describes a color as red-violet or blue-green and I will think, that's not what I see. So this is a difference between individuals in the colors that they see i.e., differences in color vision.
http://the-print-guide.blogspot.com/2010/05/issue-of-metamerism-in-print-production.html
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