Thread View: comp.os.msdos.programmer
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Started by ejohnfel
Thu, 28 Jan 1993 03:19
Wanted - PCX Compression algorithm (non 24-bit)
Author: ejohnfel
Date: Thu, 28 Jan 1993 03:19
Date: Thu, 28 Jan 1993 03:19
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Greetings netter, OK, I gots myself a teeny problem. I had a book, which had the algo. The I had to register, needless to say I had to return the book. Then I bought a book, almost the same type except its PCX compression algo was for 24-bit only :( All I need is a quik overview of the algo, and the run and string codes (the actual flag values, ie 0xff or 0xc5 etc.....) Tanx much dudes ;) Eric J.
Re: Wanted - PCX Compression algorithm (non 24-bit)
Author: Tim Triemstra
Date: Fri, 29 Jan 1993 01:32
Date: Fri, 29 Jan 1993 01:32
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In <1993Jan28.031932.20214@sbcs.sunysb.edu>, ejohnfel@libws4.ic.sunysb.edu () wrote: > OK, I gots myself a teeny problem. I had a book, which had the >algo. The I had to register, needless to say I had to return the book. Then >I bought a book, almost the same type except its PCX compression algo was >for 24-bit only :( > > All I need is a quik overview of the algo, and the run and string >codes (the actual flag values, ie 0xff or 0xc5 etc.....) If you still have the book with the 24bit version, the only difference between the 24bit version of PCX files and regular 8bit (256 color) files is that 24bit files are 3 8bit planes of each of the R,G and B values. So, you'd read in the palette (the last 768 bytes of the 256 color image) then grab the header (should be the same for a 24bit image, just expect 1 plane, not the 3 for a 24bit file) and decode the image. The rest of the compression is the same I believe. If this isn't a help, I have both Bit-Mapped Graphics and Supercharged Bit-Mapped Graphics by Rimmer. I can get a real file put together for you. I also have the ZSoft specs sheet lying around the other machine. Let me know if you need more. I've written a few different PCX viewers in alot of languages so I could probably help (although I haven't done much with 24bit files yet.) Tim. ------------------------------------------------------- | When the end comes, there will be two men standing: | | Me, and the guy I gotta kill. - Gosh I'm EVIL | ------ Tim Triemstra ------------- empath@ais.org -----
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