From: Eric Gauthier <eric@h61-24.centre.edu> Message-Id: <199509231911.PAA00931@gauthier.centre.edu> Subject: RE: color definitions To: www-html@w3.org Date: Sat, 23 Sep 1995 15:11:45 -0400 (EDT) Well, the first thing to say is that the html hex colors are listed in <RGB>. The trick to it is that the numbers listed are hexadecimal. The red,green and blue components are listed on a scale of intensity ranging from zero to 255. A quick lesson on HEX: 00 = the number zero. 09 = the number 9 0a = the number 10. ff = the number 255. Basically instead of having 9 digits you have 16 digits. Anyways, I'm sure you can find a book on hex numbers. So, the first two digits are the value for the red, the next are for the green and the last set is for the blue. The <CMY> color scheme is almost the same as <RGB>. In this numbering scheme: C = 255 - R M = 255 - G Y = 255 - B R = 255 - C G = 255 - M B = 255 - Y The <HSV> (also called the <HSB>) model is really different from these two. A good standard text to look in is: Computer Graphics by Foley, van Dam, Feiner, and Hughes (by Addison-Wesley Pub. Co). The second edition chapter 13.3.4. The <HSV> model is complicated. If you'd like to know more detail about it and cannot find the book mail me at: eric@gauthier.centre.edu Eric Gauthier