02-18-2003
core.png is very possibly a PNG image file - try using the "file" command on it.
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PNG(5) File Formats Manual PNG(5)
NAME
png - Portable Network Graphics (PNG) format
DESCRIPTION
PNG (Portable Network Graphics) is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG pro-
vides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are
supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits.
PNG is designed to work well in online viewing applications, such as the World Wide Web, so it is fully streamable with a progressive dis-
play option. PNG is robust, providing both full file integrity checking and fast, simple detection of common transmission errors. Also, PNG
can store gamma and chromaticity data for improved color matching on heterogeneous platforms.
SEE ALSO
libpng(3),zlib(3),deflate(5),andzlib(5)
PNG 1.2 specification, July 1999:
http://www.libpng.org/pub/png
or ftp://ftp.uu.net/graphics/png/documents
PNG 1.0 specification, October 1996:
RFC 2083
ftp://ds.internic.net/rfc/rfc2083.txt
or (as a W3C Recommendation) at
http://www.w3.org/TR/REC-png.html
AUTHORS
This man page: Glenn Randers-Pehrson
Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999): Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996): Thomas Boutell and others (png-list@ccrc.wustl.edu).
COPYRIGHT NOTICE
The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson. See the specification for conditions of use and distribution.
The PNG-1.0 specification is copyright (c) 1996 Massachussets Institute of Technology. See the specification for conditions of use and
distribution.
April 15, 2002 PNG(5)