** PNMTOPNG / PNGTOPNM ** version 2.37.5 - 24 October 2000 [This is a semi-official bug-fix and enhancement release; I sort of took over maintenance of this package while Willem was on an extended bike trip, and for now I'm continuing with periodic, small updates. Version 2.37 (March 1998) was never publicly released, partly because Willem had hoped to quiet gcc's "<var> might be clobbered by `longjmp'" warnings. Those are fixed in 2.37.2; under Solaris, they resulted in stack corruption even when there was no error in the image files or libraries. Version 2.37.3 fixes a minor bug w.r.t. error exits and generally does cleaner error exits (close files, etc.) Version 2.37.4 fixes a bug that caused 16-shade grayscale images to be written as 8-bit grayscale instead of (smaller) 4-bit colormapped images (bug report, analysis and fix by Rafal Rzeczkowski), and it supports the new/upcoming pbmplus release. Version 2.37.5 fixes a bug in -transparent handling (pnmtopng no longer chooses an approximate color if the specified one isn't present) and quiets a gcc warning in the non-16-bit version. --Greg Roelofs] The utilities pnmtopng and pngtopnm are based on other pbm tools and require the libraries included in the pbmplus/netpbm package. Also required are the png library and the zlib compression library. These can be found at: ftp://swrinde.nde.swri.edu/pub/png/src/libpng-* ftp://swrinde.nde.swri.edu/pub/png/src/zlib-* ftp://ftp.x.org/contrib/utilities/netpbm-1mar1994* or see http://www.libpng.org/pub/png/apps/pnmtopng.html http://netpbm.sourceforge.net/ http://www.acme.com/software/pbmplus/ [update coming soon?] To compile and install a makefile is provided. Do check the directories where you have put the required libraries. Then either accommodate the makefile or make links from generic names (e.g., zlib) to version-specific directories (e.g., zlib-1.1.3), which is the recommended way. For testing purposes, have a look at the test-set PngSuite.tar.gz, which contains a small test-image for every PNG color type and for most PNG chunk types. It can be found at: http://www.schaik.com/pngsuite/pngsuite.html ftp://swrinde.nde.swri.edu/pub/png/images/suite/ Other web pages with PNG images are at: http://www.libpng.org/pub/png/png-textures.html http://www.libpng.org/pub/png/pngs-img.html http://www.libpng.org/pub/png/pngpic2.html http://www.libpng.org/pub/png/colorcube/ http://www.libpng.org/pub/png/pngmisc.html#images ------ Alexander Lehmann <lehmann@usa.net> Willem van Schaik <willem@schaik.com> Greg Roelofs <newt@pobox.com>
