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