Linux / Unix Command: png

Command Library

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 provides 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 display 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

 

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Important: Use the man command (% man) to see how a command is used on your particular computer.

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