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- Newsgroups: comp.graphics.animation
- Path: 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
-
- 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
-