spandsp
1.99.0
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The T.85 image compression and decompression routines implement the variant of the JBIG encoding method defined in ITU specification T.85. This is an image compression algorithm used for black and white FAX transmission. T.85 defines a subset of the full JBIG spec (T.82), which only handled a single progressively scanned bit plane. This results in a great deal of simplification, and results in the ability to compress or decompress progressively, while only buffering the latest 3 pixel rows of the image.