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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
File extension: .png
MIME type: image/png
Type code: PNGf
Uniform Type Identifier: public.png
Magic: 89 50 4e 47 0d 0a 1a 0a
Developed by: PNG Development Group (donated to W3C)
Type of format: Lossless bitmap image format
Extended to: APNG, JNG and MNG
Standard(s): ISO/IEC 15948, IETF RFC 2083

Portable Network Graphics is a raster-graphics file-format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF).

PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel for transparency), and full-color non-palette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics, and therefore it does not support non-RGB color spaces such as CMYK. A PNG file contains a single image in an extensible structure of "chunks", encoding the basic pixels and other information such as textual comments and integrity checks documented in RFC 2083.

PNG files nearly always use the file extension PNG or png and are assigned MIME media type image/png. PNG was published as informational RFC 2083 in March 1997 and as an ISO/IEC standard in 2004.

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