Article View: alt.graphics.pixutils
Article #596Re: Gif picture re-ordering
From: paulf
Date: Fri, 19 Apr 1991 18:29
Date: Fri, 19 Apr 1991 18:29
15 lines
1215 bytes
1215 bytes
In article <cs442a07.672031798@zaphod> cs442a07@zippy.cs.iastate.edu writes: >The color numbers are re-ordered so that near-to-each-other pixels are >near to each other in color number; We considered doing such a thing a while back. The scheme I proposed was to take the color map, convert to YIQ, sort the colors according to I, greycode the list (so colors close in intensity are close bitwise), and convert the image. While this would do wonders for true Lempel - Ziv, it won't do anything for Lempel - Ziv - Welch, which is a BYTE oriented compression scheme. So, as my Math Phil prof once put it, "the ship sinks". -=Paul Flaherty, N9FZX | "Think of it as evolution in action." ->paulf@shasta.Stanford.EDU | -- Larry Niven and Jerry Pournelle
Technical Details
Message-ID:
<163@shasta.Stanford.EDU>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!stanford.edu!paulf@shasta.Stanford.EDUReferences:
<cs442a07.672031798@zaphod>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!stanford.edu!paulf@shasta.Stanford.EDU From: paulf@shasta.Stanford.EDU (paulf) Newsgroups: alt.graphics.pixutils,comp.graphics Subject: Re: Gif picture re-ordering Message-ID: <163@shasta.Stanford.EDU> Date: 19 Apr 91 18:29:05 GMT References: <cs442a07.672031798@zaphod> Organization: The Three Packeteers Lines: 15