Article View: comp.graphics.animation
Article #609HELP! Its Those Damned Colormaps!
From: Jeff Michel
Date: Tue, 22 Dec 1992 19:57
Date: Tue, 22 Dec 1992 19:57
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1759 bytes
I *hope* this is a FAQ. I'm doing frame-by-frame animation on Sun-4's. My approach is to put up sequences of images converted to the Sun-specific, video-RAM specific (pixrect) format and colormap format (pixrect) of the graphics hardware (cg6) of the machine. (This graphics architecture makes use of a 24-bit, 256 color colormap.) The problem with this approach has been that when the colormaps of two consecutive images in the sequence differ, there is a brief instant during which the colormap for the previous image is loaded, but the image loaded on the screen needs a different colormap. The result of this is an annoying *flicker*. Are you nodding your head? Have you seen this problem? What I'd like is for all of the video-RAM format images to have the *same* colormap so that the problem of flicker never arises. So, after three paragraphs, my question is: "Is there any software available which will allow me to normalize the colormaps of a sequence of Sun rasterfile images into *one* common colormap including all or most of the colors of the images of the sequence?" If not for Sun, then is there source code for the normalization of *any* colormap-oriented graphics architecture (eg. VGA)? Thanks, Jeff Michel jrm2k@Virginia.EDU
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Newsgroups: comp.graphics.animation Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!concert!uvaarpa!murdoch!uvacs.cs.Virginia.EDU!jrm2k From: jrm2k@uvacs.cs.Virginia.EDU (Jeff Michel) Subject: HELP! Its Those Damned Colormaps! Message-ID: <1992Dec22.195753.8789@murdoch.acc.Virginia.EDU> Keywords: sun-rasterfile, vga, colormap, normalize Sender: usenet@murdoch.acc.Virginia.EDU Organization: University of Virginia Computer Science Department Date: Tue, 22 Dec 1992 19:57:53 GMT Lines: 24