Description:

GD module is an interface to the GD library written by Thomas
Bouttel.

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.

It has been extended in some ways from the original GD library.