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Its many variations make it hard to implement.(sigh) and error correction has never been much a part of most image files, either. now, if only there was an RLE GIF compression format. Oh, and 256 colour palette limitation is actually appropriate for an indexed palette graphic file format. That's the wonderful thing about standards.

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Patent 4558302), who have been known to charge licensing fees to coders who write software to maniuplate GIFs. The seventh reason is that the compression algorithm it uses is patented by Unisys (under U.S. Now, all sorts of different formats are being used. Then, two graphics file formats covered most anything you wanted to do (except vector images). However, before Unisys sprung its booby trap on the Web, the GIF format(s) were a Good Thing, nicely complementing the JPEG format. Thus, the compressed GIF format is a TOOL OF EVIL!!! (why don't Microsoft have anything to do with it?)

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Unisys waited until GIF was a de facto standard on the Web before springing license fees on people. Most people who make amateur animated GIFs don't do any optimisations, making them hideous to use. In its animated form, GIF seems to be used mainly for annoying, bandwidth-intensive banner ads and unnecessary animated junk on websites, like rotating text headings, flashing bullets and obnoxious animated icons.Īnimated GIFs take up lots and lots of CPU cycles in Netscape for some reason. LZW-compressed GIFs, but any GIF decoder can decode them just the The images so generated are larger than traditional You can also use the -nolzw option on ppmtogif to avoid using the LZW Pngtopnm, pnmtopng), which was developed with a primary purpose of not The following Netpbm components may be restricted by this patent:Ī good substitute for GIF if the patents are a problem is PNG (see Neither company has ever enforced the patent against trivial users ofįor information from another perspective, see. Owns a patent that may cover the GIF tools. Unisys owns a patent on LZW compression, which is used by ppmtogif,Īnd maybe on LZW decompression, which is used by giftoppm. It is accompagnied by a file COPYRIGHT.PATENT, which gives the following information: The GNU netpbm package contains about two hundred file converters for graphical file formats. Just because Unisys does not go after each and every instance of patent infringement does not mean they won't go after you.-branko If Unisys only mentions that they are asking licensing fees for LZW, and does not specifically mention libre or gratis software, then this means that Unisys is expecting money for ALL use of LZW, even in libre and gratis software.

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Is this a Unisys page? If not, it can hardly be used as a source for the statement that the algorithm can be used freely for non-commercial software.-brankoĪ Unisys page doesn't mention this but the page is not specifically addressing free software. A source which states that the algorithm for creating GIFs can be freely used for non-commercial software: