Description:

gd is a graphics library. It allows your code to quickly draw images
complete with lines, arcs, text, multiple colors, cut and paste
from other images, and flood fills, and write out the result as a PNG or
JPEG file. This is particularly useful in World Wide Web
applications, where PNG and JPEG are two of the formats accepted for inline
images by most browsers.

gd is not a paint program. If you are looking for a paint program, you are
looking in the wrong place. If you are not a programmer,
you are looking in the wrong place.

gd does not provide for every possible desirable graphics operation. It is
not necessary or desirable for gd to become a kitchen-sink
graphics package, but version 1.7.3 incorporates most of the commonly
requested features for an 8-bit 2D package. Support for
truecolor images, including truecolor JPEG and PNG, is planned for version
2.0.