Format
Portable Network Graphics
Summary
- Name
- Portable Network Graphics
- Version
- 1.2
- Identifiers
-
- PUID: fmt/13
- MIME: image/png
- Apple Uniform Type Identifier: public.png
- Format type
- Image (Raster)
- Description
- Portable Network Graphics (PNG) was designed for the lossless, portable, compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits. PNG is designed to work in online viewing applications, so it is fully streamable. It can store gamma and chromaticity. PNG also detects file corruption.
- Format encoding
- Binary
- File extensions
-
png - Submitted by
- Digital Preservation Department / The National Archives
Relationships
- Has priority over
- Is subsequent version of
Internal signatures
PNG 1.2
- Description
- Signature + IHDR and iTXt chunks at BOF, IEND chunk at EOF
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
89504E470D0A1A0A0000000D49484452*69545874- Endianness
- Big-endian
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
0000000049454E44AE426082- Endianness
- Big-endian
Changelog
-
V86
- Release date
- 27 July 2016
-
Updated
Portable Network Graphics 1.2: Added description.
-
V65
- Release date
- 25 October 2012
-
Updated
Portable Network Graphics 1.2: Gave explicit priority over fmt/11 Portable Network Graphics 1.0 to remove multiple identification conflict identified through Ross Spencer's Skeleton Corpus.