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Status:

HISTORIC (changed from INFORMATIONAL)

Author:

T. Boutell

Stream:

[Legacy]

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DOI:  https://doi.org/10.17487/RFC2083

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Abstract

This document describes PNG (Portable Network Graphics), anextensible file format for the lossless, portable, well-compressedstorage of raster images. PNG provides a patent-free replacement forGIF and can also replace many common uses of TIFF. Indexed-color,grayscale, and truecolor images are supported, plus an optional alphachannel. Sample depths range from 1 to 16 bits.

PNG is designed to work well in online viewing applications, such asthe World Wide Web, so it is fully streamable with a progressivedisplay option. PNG is robust, providing both full file integritychecking and simple detection of common transmission errors. Also,PNG can store gamma and chromaticity data for improved color matchingon heterogeneous platforms.

This specification defines the Internet Media Type image/png.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.