Path: utzoo!utgpu!watmath!watcgl!jdchrist From: jdchrist@watcgl.waterloo.edu (Dan Christensen) Newsgroups: comp.sys.sgi Subject: Re: # of overlay planes Message-ID: <11110@watcgl.waterloo.edu> Date: 17 Aug 89 04:49:41 GMT References: <8908161833.AA12079@castor.wustl.edu> Reply-To: jdchrist@watcgl.waterloo.edu (Dan Christensen) Organization: Computer Graphics Lab, University of Waterloo Lines: 13 In article <8908161833.AA12079@castor.wustl.edu> weinhous@CASTOR.WUSTL.EDU ("Martin S. Weinhous") writes: > Many image processing systems, particularly those intended for the >processing of gray-scale images provide the capability of using 8 bit >planes of overlay. This allows the user to, easily, non destructively, >annotate the gray-scale images with up to 256 colors. I'd like to do >the same on my 4D120-GTX, but can't. You should be able to use colour map mode and writemasks to achieve what you want to do. How many bits do you need for the gray scale? ---- Dan Christensen, Computer Graphics Lab, jdchrist@watcgl.uwaterloo.ca University of Waterloo, Waterloo, Ont. jdchrist@watcgl.waterloo.edu