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There is a tool for checking color contrast in accordance to an specification by the W3C to determine if there's enough contrast "when viewed by someone having color deficits or when viewed on a black and white screen". This is a working draft but as close a standard as it gets in web. In this case, you should test the contrast between the different colors ...

There is no definitive answer to that question. There are so many things that are outside of your control and/or knowledge as a designer that you can't have a "rule" to say how far apart two RGB-color-values have to be. Some things to consider: Quality, type and settings (brightness and such) of your computer screen affect this a lot (check out Atwood's ...

As Chris suggested, the two eyes work together. Remember, vision is not a property of one eye; the vision is a joint effort between both eyes, the nerves and the brain. Since the eyes are generally focused in one area, they work together and the brain joins the two images into one, like a panorama setting on a camera. In that way, you are basically designing ...

It makes a huge difference whether this is about adjacent colors (which include background-foreground contrasts) or non-adjacent colors. Our eyes are very sensitive to perceiving a difference between adjacent colors. But we're very poor at recognizing a non-adjacent match. Color differences in adjacent colors can be expressed in delta-E. 1 delta-E is the ...