hartlemp@mentor.cc.purdue.edu (Michael P Hartley) (04/28/91)
Is there some way to compress/archive gif files? I have tried the normal archivers (zip, arc, lzh, ect...) and they can only store the gif. No compression. I would appreciate pointers to some gif archiver. **************************************************************************** * \ | / "A 40 kW Full-Spec EMR in every satellite * * \ | / by the year 1995!" * * ---*-----------------------------==============>>>>>>>>>>>>||||||||| * * / | \ Michael Hartley (Yes, I did melt that) * * / | \ Purdue University * * hartley@maxwell.physics.purdue.edu hartlemp@mentor.cc.purdue.edu * * hartley@bard7.cs.purdue.edu me@my.self.and.I * ****************************************************************************
elmanad@leland.Stanford.EDU (Adam Elman) (04/28/91)
In article <11442@mentor.cc.purdue.edu> hartlemp@mentor.cc.purdue.edu (Michael P Hartley) writes: > > Is there some way to compress/archive gif files? I have >tried the normal archivers (zip, arc, lzh, ect...) and >they can only store the gif. No compression. I would >appreciate pointers to some gif archiver. > My understanding is that the reason that zip, arc, lzh etc. cannot compress a gif image is that the gif file format itself is already compressed, and other compression software cannot compress it further. Adam Elman elmanad@leland.stanford.edu
pedro@cs.mcgill.ca (Sandro MAZZUCATO) (04/28/91)
In article <1991Apr27.215625.7689@leland.Stanford.EDU> elmanad@leland.Stanford.EDU (Adam Elman) writes: >My understanding is that the reason that zip, arc, lzh etc. cannot >compress a gif image is that the gif file format itself is already >compressed, and other compression software cannot compress it further. > >Adam Elman >elmanad@leland.stanford.edu Yes in fact it is using the LZW algorithm for compressing the image ! --------------------------------------------------------------------------- Sandro Mazzucato Internet : pedro@cs.mcgill.ca BSc, U2, Computer Science. McGill University - Montreal, Quebec, Canada
bewhite@matt.ksu.ksu.edu (Goomee Goomee) (04/28/91)
elmanad@leland.Stanford.EDU (Adam Elman) writes: >In article <11442@mentor.cc.purdue.edu> hartlemp@mentor.cc.purdue.edu (Michael P Hartley) writes: >> >> Is there some way to compress/archive gif files? I have >> >My understanding is that the reason that zip, arc, lzh etc. cannot >compress a gif image is that the gif file format itself is already >compressed, and other compression software cannot compress it further. I have seen a way to compress gif files. I recently downloaded a program from a BBS call gif2jpg. This converts gif files to the jpeg format. On the image I used, this gave me a savings of about 40%. However, the jpeg format is not directly viewable, the conversion is VERY time consuming, and the conversion does not actually give you back the EXACT same image. Some degredation occurs, so I don't use it. But if you want to compress some images for later viewing and you don't care about a little loss in quality, you can use it. -- Bruce White (bewhite@matt.ksu.ksu.edu) - I know what I like - (Home: (913)776-2366) And I learn what I know. "Not every BMW's performance can be measured on a speedometer." " - Worth the obsession"
c60b-1eq@e260-1g.berkeley.edu (Noam Mendelson) (04/28/91)
In article <11442@mentor.cc.purdue.edu> hartlemp@mentor.cc.purdue.edu (Michael P Hartley) writes: > Is there some way to compress/archive gif files? I have >tried the normal archivers (zip, arc, lzh, ect...) and >they can only store the gif. No compression. I would >appreciate pointers to some gif archiver. The problem with GIF's is that they're already compressed. General-purpose archivers can't compress them much tighter. However, I know of at least one shareware program which will convert GIF files to JPG format, yielding approximately 50% compression. Of course, these JPG files can't be displayed directly, but there is a significant reduction in the size of the GIF. Followup to comp.compression. -- +==========================================================================+ | Noam Mendelson ..!ucbvax!web!c60b-1eq | "I haven't lost my mind, | | c60b-1eq@web.Berkeley.EDU | it's backed up on tape | | University of California at Berkeley | somewhere." |
hartlemp@mentor.cc.purdue.edu (Michael P Hartley) (04/29/91)
I would like to thank all of the people who responded to my post. to date, there have been 37 different responses. Everyone said that gifs are already compressed. - thanks again. Mike.
dmerrill@hpdtczb.HP.COM (David Merrill) (04/30/91)
In comp.binaries.ibm.pc.d, hartlemp@mentor.cc.purdue.edu (Michael P Hartley) writes: > Is there some way to compress/archive gif files? I have >tried the normal archivers (zip, arc, lzh, ect...) and >they can only store the gif. No compression. I would >appreciate pointers to some gif archiver. > **************************************************************************** > * \ | / "A 40 kW Full-Spec EMR in every satellite * > * \ | / by the year 1995!" * > * ---*-----------------------------==============>>>>>>>>>>>>||||||||| * > * / | \ Michael Hartley (Yes, I did melt that) * > * / | \ Purdue University * > * hartley@maxwell.physics.purdue.edu hartlemp@mentor.cc.purdue.edu * > * hartley@bard7.cs.purdue.edu me@my.self.and.I * > **************************************************************************** GIF's are already compressed. There, that was easy! Dave