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Portable Network Graphics (PNG, officially pronounced / p ɪ ŋ / [3] [4] PING, colloquially pronounced / ˌ p iː ɛ n ˈ dʒ iː / [5] PEE-en-JEE) is a raster-graphics file format that supports lossless data compression. [6]
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libpng is the official Portable Network Graphics (PNG) reference library (originally called pnglib). It is a platform-independent library that contains C functions for handling PNG images. It supports almost all of PNG's features, is extensible, and has been widely used and tested for over 28 years.
Animated Portable Network Graphics (APNG) is a file format which extends the Portable Network Graphics (PNG) specification to permit animated images that work similarly to animated GIF files, while supporting 24 or 48-bit images and full alpha transparency not available for GIFs. It also retains backward compatibility with non-animated PNG files.
Chris Lilley (born 1959 in the UK) is a British computer scientist known for co-authoring the Portable Network Graphics (PNG) format, starting the Scalable Vector Graphics (SVG) format, and his work on HTML2, CSS2, and Web fonts.
The PPM format is not compressed, and thus requires more space and bandwidth than a compressed format would. For example, the above 192×128 PNG (Portable Network Graphics) image has a file size of 166 bytes. When converted to a 192×128 PPM image, the file size is 73,848 bytes.
The PNG (Portable Network Graphics) file format was created as a free, open-source alternative to GIF. The PNG file format supports 8-bit (256 colors) paletted images (with optional transparency for all palette colors) and 24-bit truecolor (16 million colors) or 48-bit truecolor with and without alpha channel – while GIF supports only 8-bit ...
The original specification for the Portable Network Graphics (PNG), version 1.0, was written by Thomas Boutell and Lane, with contributions by many others. Lane is a contributing editor for PNG Specification, version 1.1.