View source for GD image format

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|gd}}
|released=~1994
}}
'''GD image format''' is a raster graphics file format associated with the GD graphics library (a.k.a. LibGD), originally developed by Thomas Boutell.

The GD image format is a special purpose format that can be read very quickly. It is ''not'' GD's preferred format -- standard formats like [[GIF]] and [[PNG]] are preferred.

There are several versions of GD format.

See also [[GD2 image format]].

== Identification ==
GD 1.x: There's no easy way to identify this format version.

GD 2.x palette color: Starts with bytes {{magic|0xff 0xff}}, and has {{magic|0x00}} at offset 6.

GD 2.x truecolor: Starts with bytes {{magic|0xff 0xff}} (v2.0.0-2.0.11) or {{magic|0xff 0xfe}} (v2.0.12+), and has {{magic|0x01}} at offset 6.

== Specifications ==
* Refer to the source code comments in modern versions of the [https://github.com/libgd/libgd/blob/master/src/gd_gd.c gd_gd.c] file.

== Software ==
* GD/LibGD
** [https://web.archive.org/web/19961201000000*/http://www.boutell.com/gd/gd1.2.tar.Z GD 1.2], from the Wayback Machine
** https://ftp.mizar.org/packages/gd/ - Various versions
** See the [https://libgd.github.io/pages/downloads.html LibGD website] for the latest release.
** [https://github.com/libgd/libgd LibGD GitHub project]

== Sample files ==
* {{DexvertSamples|image/gd}}

== Links ==
* [https://libgd.github.io/ LibGD website]
* [https://libgd.github.io/manuals/2.3.0/files/gd_gd-c.html LibGD website format info]