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December 1994
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1994.12.16 18:00 "Re: JBIG compression", by Fredrik Lundh
Sam Leffler writes: > My understanding is that JBIG requires the licensing of several > patents. This makes it an unlikely candidate for a free software > package such as mine. JBIG relies heavily on arithmetic coding, an entropy coding method patented by IBM. The JBIG arithmetic coder is identical to the one defined in the JPEG standard. Luckily, JPEG also allows Huffman coding, making it possible for the IJG to provide a public domain implementation from which arithmetic coding has been left out. Talking about licensing; what applies to the LZW compression implemented in LibTIFF? /F BTW: I'm not that sure that JBIG should be stuffed into TIFF at all; the forthcoming ISO SPIFF standard merges JPEG, JBIG and Group 3/4 into one very complete interchange format.