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→Colors that can't be reproduced
::Another problem, at least with ordinary printed pictures, is that halftone processes are at their ''very worst'' trying to produce a nice, smooth, even gradation of tone or color. A phenonemon called "banding" almost always occurs to some degree, in which tones that should grade evenly separate out into bands that have noticeable edges. So something like a spectrum, or a rainbow, or for that matter the gradual shading in any blue sky, are a severe test of printing quality. [[User:Dpbsmith|Dpbsmith]] 13:04, 16 March 2007 (EDT)
::Another problem, at least with ordinary printed pictures, is that halftone processes are at their ''very worst'' trying to produce a nice, smooth, even gradation of tone or color. A phenonemon called "banding" almost always occurs to some degree, in which tones that should grade evenly separate out into bands that have noticeable edges. So something like a spectrum, or a rainbow, or for that matter the gradual shading in any blue sky, are a severe test of printing quality. [[User:Dpbsmith|Dpbsmith]] 13:04, 16 March 2007 (EDT)
::Backtracking...of course, I could be wrong... because it occurs to me that a rainbow, rather than a spectrum produced by a prism, might have enough blending to lie within a "Maxwell triangle..." No time to track this down. Similarly, some of the talk about "circular rainbows" above, including the images found in a Google search, are really a related but different phenomenon properly called a "glory." The circular rainbow at Niagara Falls is real, though I've been going nuts trying to find a photograph. [[User:Dpbsmith|Dpbsmith]] 13:10, 16 March 2007 (EDT)