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JBIGTOPNM !!!JBIGTOPNM NAME SYNOPSIS DESCRIPTION OPTIONS STANDARDS AUTHOR SEE ALSO LICENSE ---- !!NAME jbigtopnm - JBIG to PNM image file converter !!SYNOPSIS __jbigtopnm__ [[ ''options'' ] [[ ''input-file'' | - [[ ''output-file'' ]] !!DESCRIPTION Reads in a ''JBIG'' bi-level image entity (BIE) from a file or standard input, decompresses it, and outputs a PBM or PGM file. If the input has one plane, or you choose just one plane of it, the output is PBM. Otherwise, the output is PGM. ''JBIG'' is a highly effective lossless compression algorithm for bi-level images (one bit per pixel), which is particularly suitable for scanned document pages. A ''JBIG'' encoded image can be stored in several resolutions in one or several BIEs. All resolution layers except the lowest one are stored efficiently as differences to the next lower resolution layer. Options __-x__ and __-y__ can be used to stop the decompression at a specified maximal output image size. The input file can consist of several concatenated BIEs which contain different increasing resolution layers of the same image. !!OPTIONS __-__ A single hyphen instead of an input file name will cause __jbigtopnm__ to read the data from standard input instead from a file. __-x__ ''number'' Decode only up to the largest resolution layer which is still not more than ''number'' pixels wide. If no such resolution layer exists, then use the smallest one available. __-y__ ''number'' Decode only up to the largest resolution layer which is still not more than ''number'' pixels high. If no such resolution layer exists, then use the smallest one available. Options __-x__ and __-y__ can also be used together in which case the largest layer that satisfies both limits will be selected. __-b__ Use binary values instead of Gray code words in order to decode pixel values from multiple bitplanes. This option has only an effect if the input has more than one bitplane and you don't select just one of those bitplanes. Note that the decoder has to be used in the same mode as the encoder and cannot determine from the BIE, whether Gray or binary code words were used by the encoder. __-d__ Diagnose a BIE. With this option, __jbigtopnm__ will only print a summary of the header information found in the input file and then exit. __-p__ ''number'' If the input contains multiple bitplanes, then extract only the specified single plane as a PBM file. The first plane has number 0. !!STANDARDS This program implements the ''JBIG'' image coding algorithm as specified in ISO/IEC 11544:1993 and ITU-T T.82(1993). !!AUTHOR The __jbigtopnm__ is based on the ''JBIG'' library by Markus Kuhn, part of his __JBIG-KIT__ package. The __jbgtopbm__ program is part of the ''JBIG-KIT'' package. The most recent version of that library and tools set is freely available on the Internet from anonymous ftp server ftp.informatik.uni-erlangen.de in directory pub/doc/ISO/JBIG/. __jbigtopnm__ is part of the Netpbm package of graphics tools. !!SEE ALSO pbm(5),pgm(5),pbmtojbg(1) !!LICENSE If you use __jbigtopnm__, you are using various patents, particularly on its arithmetic encoding method, and in all probability you do not have a license from the patent owners to do so. ----
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