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Difference between revisions of "Portable Network Graphics (PNG)"

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=See Also=
=See Also=
* [ Tools for extracting image metadata]
* [[:Tools:Document_Metadata_Extraction#Images|Tools for extracting image metadata]]
=External Links=
=External Links=

Latest revision as of 08:22, 29 July 2012

Portable Network Graphics (aka PNG) is an image file format developed to replace GIF images on the web. It uses lossless compression and is thus not ideal for photographs. The types of images ideally suited for PNG are line-art, text, other graphics that have sharp transitions.


A PNG file comprises "chunks" of data, some of which are mandatory and others of which are ancillary. Some ancillary chunks can contain metadata text or timestamps, but does not contain nearly as much metadata as exif images.

PNG files begin with the following 8-byte (hexadecimal) signature:

89 50 4E 47 0D 0A 1A 0A

See Also

External Links