16 lines
1.3 KiB
Markdown
16 lines
1.3 KiB
Markdown
|
---
|
||
|
|
obj: codec
|
||
|
|
---
|
||
|
|
# PNG
|
||
|
|
Portable Network Graphics (PNG) is a raster-graphics file format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF) — unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF".
|
||
|
|
|
||
|
|
PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and full-color non-palette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics; therefore non-RGB color spaces such as CMYK are not supported. A PNG file contains a single image in an extensible structure of chunks, encoding the basic pixels and other information such as textual comments and integrity checks documented in RFC 2083.
|
||
|
|
|
||
|
|
PNG files use the file extension PNG or png and are assigned [MIME](../../files/MIME.md) media type image/png. PNG was published as informational RFC 2083 in March 1997 and as an ISO/IEC 15948 standard in 2004.
|
||
|
|
|
||
|
|
| Name | Value |
|
||
|
|
| ------------ | ------------------------- |
|
||
|
|
| Extension | .png |
|
||
|
|
| [MIME](../../files/MIME.md) | image/png |
|
||
|
|
| Magic Number | `89 50 4e 47 0d 0a 1a 0a` |
|