image processing - How to find colors very close in the RGB spectrum but perceived very different by humans? -


i'm trying construct captcha based on color similarity keeping text color c1 close background noise color c2 in rgb color model. c1 , c2 in reality should perceived different humans, users can read text @ same time difficult decode text through programming. there combination of color closer in color models in reality perceived different humans?

i know can test similarity of colors using delta e concept of lab color model. but, how identify such colors in rgb color model systematically without hit , trial?


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