Portable Network Graphics (PNG) - Revision history

Joachim Metz: /* See Also */

2012-07-29T08:22:56Z

‎See Also

Joachim Metz: /* Format */

2012-07-29T08:22:10Z

‎Format

Joachim Metz: moved PNG to Portable Network Graphics (PNG): This allows the article to be found more easier.

2012-07-29T08:20:58Z

moved PNG to Portable Network Graphics (PNG): This allows the article to be found more easier.

Hypertex at 18:45, 9 April 2010

2010-04-09T18:45:26Z

Hypertex: Created page

2010-04-09T14:58:38Z

Created page

New page

'''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.

=Format=
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. All PNG files begin with an 8-byte signature: <tt>89 50 4E 47 0D 0A 1A 0A</tt> (hexadecimaml).

=See Also=
* [http://www.forensicswiki.org/wiki/Tools:Document_Metadata_Extraction#Images Tools for extracting image metadata]

=External Links=
* [http://en.wikipedia.org/wiki/Portable_Network_Graphics Wikipedia article]
* [http://www.w3.org/TR/2003/REC-PNG-20031110/ W3C Recommendation]

[[Category:File Formats]]

@@ Line 10: / Line 10: @@
 =See Also=
-* [http://www.forensicswiki.org/wiki/Tools:Document_Metadata_Extraction#Images Tools for extracting image metadata]
+* [[:Tools:Document_Metadata_Extraction#Images|Tools for extracting image metadata]]
 =External Links=

@@ Line 2: / Line 2: @@
 =Format=
-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.  All PNG files begin with an 8-byte signature: <tt>89 50 4E 47 0D 0A 1A 0A</tt> (hexadecimal).
+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.
 =See Also=