Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!sdd.hp.com!wuarchive!uunet!zephyr.ens.tek.com!uw-beaver!milton!sumax!polari!rwing!seaeast!burklabs!ronb From: ronb@burklabs (Ron Burk ) Newsgroups: comp.windows.ms.programmer Subject: Re: RGB and IHS controls Message-ID: Date: 30 May 91 18:38:26 GMT References: Organization: Burk Labs, Redmond WA Lines: 14 aew@eosvcr.wimsey.bc.ca (Alan Walford) writes: > > Anybody know the conversions between RGB (red, green, blue) and IHS > (intensity, hue, saturation) ? I think you want the Tektronix HLS (hue, lightness, saturation) model (because I think that's what the Windows desktop uses). In any case, this and other models are supplied in "Fundamentals of Interactive Computer Graphics", by Foley and Van Dam. The algorithm they supply is not the simple matrix multiplication you suggest. Has anyone made a free HLS color slider for Windows apps that everyone can use?