how do we perceive contrast in colors?

does the human eye see more constrant in specific pairs of analog colors, comparing to other pairs that are equally (matematically in RGB) contrasted? looking at the triangle in the image, how do you feel the contrast between pairs of analog (neighbor colors)? are there pairs that are more constrant than others?

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Re-design8 years ago
Did you forget to leave us a link to the "triangle"? Nice discussion kevinhannan.
I think he/she just copied the text from the homework problem...I doubt he/she had access to a scanner to get the graphic from his/her textbook.
seandogue8 years ago
colors that oppose each other on the color wheel generally have a more distinct delineation between each other. It has to do with our innate biological dithering of colors closely grouped in the spectrum, and concomitant inability to dither those that are disparate.
Kiteman8 years ago
The humans eye/brain system perceives the greatest contrast between black and bright yellow, as an evolutionary consequence of dangerous animals using those colours as a warning.
kevinhannan8 years ago
I can give you a partial answer from memory when I did A level psychology... Feel free to add and/or correct, but I'm pretty sure I'm right but research might have updated stuff somewhat. The retina is coated with rods and cones, but not equally; I've forgotten the ratio. The rods see light intensity and it is a very dark purple that looks almost black. The cones see colour. We can detect movement at its finest (20:20 vision) when an object crosses two sets of rods and cones, we cannot detect movement if that movement is across one set of rods and cones. Object permanence occurs when we look at something the rods and cones become 'bleached' at receiving that image and because it takes time for that to settle down again we can still see that image if we close our eyes. An experiment to do this would be to cut a shape out of thick card and shine a light behind it. Look at the image for a few seconds and then look away and close your eyes and you can still see the object. This is relevant to the last part of your Q about comparing contrasts as this will be subjective to each person as it is a unique event. Unfortunately, even after many re-reads, I couldn't really understand the first part of your Q. As far as I could get, I think you are asking is there a mathematical for our sight? Up to a point, yes, because of the bleaching that occurs but then as each person sees things differently it is unique and not a mathematical relationship between people. A thought for you to illustrate this: imagine both you and I are looking at a single image, say a green card. Now both you and I might say it is green but there is (yet) no way of knowing that we have both seen exactly the same colour because of the way our retina, optic chiasma and brain interprets that image.