Editing Portal:Graphics Programming (section)

=== GD and simple generated graphics ===

Another historically important Perl graphics library is '''GD'''. `GD.pm` is a Perl interface to Thomas Boutell’s gd graphics library. MetaCPAN describes GD as allowing Perl programs to create color drawings using graphics primitives and emit the drawings as PNG files.<ref>MetaCPAN, “GD,” https://metacpan.org/pod/GD, accessed July 3, 2026.</ref>

GD was widely used for dynamic web graphics because it was relatively simple and well suited to generating images from code. A Perl program using GD could create a blank canvas, draw lines, rectangles, polygons, arcs, filled shapes, text, and simple charts, then output a PNG image to a browser or file.

GD’s role in Perl graphics was different from ImageMagick’s. ImageMagick was powerful for manipulating existing images and converting between formats. GD was often used to create new raster images from scratch.

GD was useful for:

* counters;
* small charts;
* buttons;
* badges;
* diagrams;
* maps;
* labels;
* simple graphs;
* CAPTCHA-style images;
* generated PNG output from CGI scripts.

Many early dynamic web applications used GD because it was direct, scriptable, and practical.