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png(5) [suse man page]

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 specification (second edition), November 2003:

		<http://www.w3.org/TR/2003/REC-PNG-20031110/ PNG 1.2 specification, July 1999:

	      http://www.libpng.org/pub/png

       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 (Second Edition) Information technology - Computer graphics and image processing - Portable
       Network Graphics (PNG): Functional specification.  ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.

       Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999): Glenn Randers-Pehrson and others (png-list).

       Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996): Thomas Boutell and others (png-list).

COPYRIGHT NOTICE

       This man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson.	See png.h for conditions of use and distribution.

       The PNG Specification (Second Edition) is Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.

       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 Massachusetts Institute of Technology.  See the specification for  conditions  of  use  and
       distribution.

								   June 26, 2010							    PNG(5)

Check Out this Related Man Page

img-png(n)																img-png(n)

NAME

       img-png - Img, Portable Network Graphics format (png)

SYNOPSIS

       package require Tk

       package require img::png  ?1.3?

       image create photo ?name? ?options?

DESCRIPTION

       The  package  img::png  is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its
       own, via package require img::png.

       Like all packages of Img it does not provide new commands, but extends the existing Tk command image so that it supports  files	containing
       raster images in the Portable Network Graphics format (png). More specifically img::png extends Tk's photo image type.

       The  name  of  the new format handler is png.  This handler provides new additional configuration options. See section PNG OPTIONS for more
       detailed explanations.

       All of the above means that in a call like

       image create photo ?name? ?options?

       [1]    Image data in png format (options -data and -file) is detected automatically.

       [2]    The format name png is recognized by the option -format.	In addition the value for the option is treated as list  and  may  contain
	      any of the special options listed in section PNG OPTIONS.

PNG OPTIONS

       The  handler  provides no true options at all, but accepts pairs of keys and values when writing a PNG file. Each pair will be written as a
       named text chunk where the key provides the name of the chunk and the value its contents.  For example
	   png Author <name> Title <title> Description ...

TRANSPARENCY

       If you want to write images to disk which contain transparency information (e.g. PNG with alpha channel) you need at least Tk 8.3.

SEE ALSO

       img-bmp, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun,  img-tga,  img-tiff,  img-
       window, img-xbm, img-xpm

KEYWORDS

       image handling, png, tk

COPYRIGHT

       Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com>

Img									1.3								img-png(n)
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