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Date: Tue, 10 Dec 1996 17:33:10 GMTServer: NCSA/1.4.2Content-type: text/html<html><head><title>Color Perception and Correcting for Chromatic Induction</title></head><body><center><h1>Color Perception and Correcting for Chromatic Induction</h1></center><h4>Research in progress, joint with Corin Anderson, Evan McLain, DavidSalesin, and Dani Lischinski</h4>In human vision, the perceived color of an object does not depend solelyupon the physical light that leaves the surface of that object. Many otherfactors play a role in the perceived color, including the color and brightnessof surrounding objects. This is most clearly noted in the image below:<p><img src="images/blocks.gif" alt="[Image of obvious color shifts]"><p>Believe it or not, the two center gray boxes are the same color,although they clearly do not appear to be so. This is due to<em>chromatic induction</em> (actually, it is brightness induction,but that subtly doesn't matter a whole lot here). Automaticallycorrecting (<i>i.e.</i> removing) this effect is the topic of ourresearch.<p>As motivation for this research, consider the case where the image belowwere your company logo:<p><img src="images/logo_half.gif" alt="[Image of gray company logo]"><p>If you were to compose your logo with the image below on the left, you wouldgenerate an image like that shown below and on the right:<p><img src="images/colors_half.gif"alt="[Green field on top, yellow field on bottom]"><img src="images/ugly_half.gif"alt="[Composite image: gray logo looks red on top, blue on bottom]"><p>This is an undesireable effect -- your company logo is supposed to be allgray, not red on top, green on bottom, and blue on the side! So you mustsomehow correct this problem.<p>One method of correction is simple avoidance: never put your company logoon any strongly colored backgrounds. The problem with this solution isthat you are now restricted with what you can do with your company's logo.The second solution is to hand-correct your company's logo. That is, withthe knowledge that the top of your logo will become reddish, you could addgreen to your logo, and balance the chromatic induction. While thissolution works for simple cases such as the one above, consider, the casebelow, where the background color changes widely and smoothly. It wouldbe difficult to guess what the resulting induced effects would be:<p><img src="images/spots_half.gif" alt="[Logo on mottled background withsmooth color transitions]"><p>The third alternative is to have a computer automatically correct forchromatic induction, letting you have complete freedom of design with yourcompany's logo. This is what our research is doing. Our goal is todesign a program whose input is the graphic artist's image, where colorsare specified by what color <em>should be perceived</em> at each point.The program would compute how the design elements will interact with eachother by chromatic and brightness induction, and adjust the imageaccordingly. The output would be an image whose <em>physical</em> colorsmay be different than the input's, but whose <em>perceived</em> colorswould be what the graphic artist specified.<p><address>corin@cs.washington.edu</address></body></html>?? 快捷鍵說明
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