** PNMTOPNG / PNGTOPNM
** version 2.36 - June 1997

The utilities pnmtopng and pngtopnm are based on other pbm tools and
require the libraries included in the pbmplus 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*

To compile and install a makefile is provided. Do check the directories
where you have put the required libraries. Then either accomodate the 
makefile or make links from generic names to version specific directories,
which is the recommended way.

For testing purposes, have a look at the test-set PngSuite.tar.gz, which
contains for all PNG color-types and various chunk types a small test-
image. It can be found at:
        http://mht3.gintic.gov.sg:8000/pngsuite/
	ftp://swrinde.nde.swri.edu/pub/png/images/suite/pngsuite

------
Alexander Lehmann <alex@hal.rhein-main.de>
Willem van Schaik <willem@gintic.gov.sg>