Portable Network Graphics

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Portable Network Graphics (PNG, pronounced /ˈpɪŋ/[1] ping) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license. The PNG acronym is optionally recursive, unofficially standing for PNG's Not GIF.[1]

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

PNG files nearly always use file extension "PNG" or "png" and are assigned MIME media type "image/png"; it was approved for this use by the Internet Engineering Steering Group on October 14, 1996.[2]


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