Format
Portable Network Graphics
Summary
- Name
- Portable Network Graphics
- Version
- 1.1
- Identifiers
-
- PUID: fmt/12
- 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.
- File extensions
-
png - Source
- Digital Preservation Department / The National Archives
Relationships
- Has lower priority than
- Has priority over
- Is previous version of
- Is subsequent version of
Internal signatures
PNG 1.1iCCP
- Note
- Signature + IHDR and iCCP chunks at BOF, IEND chunk at EOF
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
89504E470D0A1A0A0000000D49484452*69434350- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
0000000049454E44AE426082- Endianness
- None
PNG 1.1sPLT
- Note
- Signature + IHDR and sPLT chunks at BOF, IEND chunk at EOF
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
89504E470D0A1A0A0000000D49484452*73504C54- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
0000000049454E44AE426082- Endianness
- None
PNG 1.1sRGB
- Note
- Signature + IHDR and sRGB chunks at BOF, IEND chunk at EOF
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
89504E470D0A1A0A0000000D49484452*73524742- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
0000000049454E44AE426082- Endianness
- None
Changelog
-
Updated in V86
- Release date
- 27 July 2016
Portable Network Graphics 1.1: Added description.