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Portable Network Graphics

Portable Network Graphics

PNG transparency demonstration 1.png

A PNG image with an 8-bit transparency channel, overlaid onto a checkered background, typically used in graphics software to indicate transparency.
Filename extension .png
Internet media type image/png
Type code PNGf
PNG
Uniform Type Identifier (UTI) public.png
Magic number 89 50 4e 47 0d 0a 1a 0a
Developed by PNG Development Group (donated to W3C)
Initial release 1 October 1996; 20 years ago (1996-10-01)
Type of format lossless bitmap image format
Extended to APNG, JNG and MNG
Standard ISO/IEC 15948,IETF RFC 2083
Open format? Yes

PNG transparency demonstration 1.png

Portable Network Graphics (PNG /ˈpɪŋ/) is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF), and is the most widely used lossless image compression format on the Internet.

PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB[A] images (with or without alpha channel). PNG was designed for transferring images on the Internet, not for professional-quality print graphics, and therefore does not support non-RGB color spaces such as CMYK.

PNG files nearly always use file extension PNG or png and are assigned MIME media type image/png. PNG was approved for this use by the Internet Engineering Steering Group on 14 October 1996, and was published as an ISO/IEC standard in 2004.


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