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POTRACE - transform bitmaps into vector graphics * * * DESCRIPTION Potrace is a utility for tracing a bitmap, which means, transforming a bitmap into a smooth, scalable image. The input is a bitmap (PBM, PGM, PPM, or BMP), and the default output is one of several vector file formats. A typical use is to create EPS files from scanned data, such as company or university logos, handwritten notes, etc. The resulting image is not "jaggy" like a bitmap, but smooth. It can then be rendered at any resolution. Potrace can currently produce the following output formats: EPS, PostScript, PDF, SVG (scalable vector graphics), DXF, PGM (for easy antialiasing of pixel-based images), Gimppath, and XFig. Additional backends might be added in the future. A separate program, mkbitmap, is also provided. This program can act as a pre-processor for Potrace, applying scaling and various filters to an image before converting it to a bitmap. This is useful for potracing greyscale and color images. DEPENDENCIES Potrace relies on the zlib library for PostScript level 3 compression. This library is pre-installed on most modern systems. If not present, it can be obtained from http://www.gzip.org/zlib/. COMPILATION For generic compilation instructions, see the file INSTALL. In addition, the following compile time options (options to ./configure) are supported. --with-libpotrace install Potrace library and headers (default: no) --disable-zlib disable PostScript level 3 compression --enable-metric use metric units (centimeters) as default --enable-a4 use a4 as the default papersize --enable-dumb-tty use simplified ASCII-only progress bar See also ./configure --help. INSTALLING If you are installing from sources, just do "make install" as root. If you are installing from a binary distribution, just copy the "potrace" and "mkbitmap" binaries to a place where the operating system expects them, such as /usr/local/bin. Also copy the files "potrace.1" and "mkbitmap.1" to a directory where the operating system looks for man pages, such as /usr/local/man/man1. For instructions on installing Potrace under Windows, see the file README-WIN USAGE For more detailed usage information, see the man page. Usage: potrace [options] [filename...] ----- rem -c, --cleartext - do not compress the output rem -o, --output <filename> - write all output to this file rem -q, --longcoding - do not optimize for file size rem -n, --longcurve - turn off curve optimization ----- General options: -h, --help - print this help message and exit -v, --version - print version info and exit -l, --license - print license info and exit File selection: <filename> - an input file -o, --output <filename> - write all output to this file -- - end of options; 0 or more input filenames follow Backend selection: -b, --backend <name> - select backend by name -e, --eps - EPS backend (encapsulated PostScript) (default) -p, --postscript - PostScript backend -s, --svg - SVG backend (scalable vector graphics) -g, --pgm - PGM backend (portable greymap) -b pdf - PDF backend (portable document format) -b pdfpage - fixed page-size PDF backend -b dxf - DXF backend (drawing interchange format) -b gimppath - Gimppath backend (GNU Gimp) -b xfig - XFig backend Algorithm options: -z, --turnpolicy <policy> - how to resolve ambiguities in path decomposition -t, --turdsize <n> - suppress speckles of up to this size (default 2) -a, --alphamax <n> - corner threshold parameter (default 1) -n, --longcurve - turn off curve optimization -O, --opttolerance <n> - curve optimization tolerance (default 0.2) -u, --unit <n> - quantize output to 1/unit pixels (default 10) -d, --debug <n> - produce debugging output of type n (n=1,2,3) Scaling and placement options: -P, --pagesize <format> - page size (default is letter) -W, --width <dim> - width of output image -H, --height <dim> - height of output image -r, --resolution <n>[x<n>] - resolution (in dpi) -x, --scale <n>[x<n>] - scaling factor (pixel-based backends) -S, --stretch <n> - yresolution/xresolution -A, --rotate <angle> - rotate counterclockwise by angle -M, --margin <dim> - margin -L, --leftmargin <dim> - left margin -R, --rightmargin <dim> - right margin -T, --topmargin <dim> - top margin -B, --bottommargin <dim> - bottom margin --tight - remove whitespace around the input image Color options, supported by some backends: -C, --color #rrggbb - set line color (default black) --fillcolor #rrggbb - set fill color (default transparent) --opaque - make white shapes opaque SVG options: --group - group related paths together --flat - whole image as a single path Postscript/EPS/PDF options: -c, --cleartext - do not compress the output -2, --level2 - use postscript level 2 compression (default) -3, --level3 - use postscript level 3 compression -q, --longcoding - do not optimize for file size PGM options: -G, --gamma <n> - gamma value for anti-aliasing (default 2.2) Frontend options: -k, --blacklevel <n> - black/white cutoff in input file (default 0.5) -i, --invert - invert bitmap Progress bar options: --progress - show progress bar --tty <mode> - progress bar rendering: vt100 or dumb Dimensions can have optional units, e.g. 6.5in, 15cm, 100pt. Default is inches (or pixels for pgm, dxf, and gimppath backends). Possible input file formats are: pnm (pbm, pgm, ppm), bmp. Backends are: eps, postscript, ps, pdf, pdfpage, svg, dxf, pgm, gimppath, xfig. POTRACE LIBRARY (FOR DEVELOPERS) As of Potrace release 1.6, the Potrace core functionality has been separated into a library libpotrace.a. This makes it easy to integrate tracing functionality into other GPL programs. The API of the library is defined in the header file potracelib.h, and is documented in doc/potracelib.pdf. It is not by default installed, but can be installed with the --with-libpotrace configuration option. DOCUMENTATION Usage information is contained in the man page: http://potrace.sourceforge.net/potrace.html Many common questions are answered in the FAQ: http://potrace.sourceforge.net/faq.html Some examples are given on the following web pages: http://potrace.sourceforge.net/samples.html http://potrace.sourceforge.net/mkbitmap.html The inner workings of the potrace algorithm are explained here: http://potrace.sourceforge.net/potrace.pdf The potrace library is documented here: http://potrace.sourceforge.net/potracelib.pdf COPYRIGHT Copyright (C) 2001-2011 Peter Selinger This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this pro