PHP Image Resize
Resources for resizing images using PHP.
Official Guide to PHP Image Functions
Official PHP site page explaining the various PHP image functions.
Pear Image Transform with PHP
A software suite to create, edit, and compose bitmap images. It can read,
convert and write images in a large variety of formats. Images can be cropped,
colors can be changed, various effects can be applied, images can be rotated
and combined, and text, lines, polygons, ellipses and Bézier curves
can be added to images and stretched and rotated. Most of the functionality
of ImageMagick can be used interactively from the command line; more often,
however, the features are used from programs written in the programming
languages C, Ch, C++, Java, Lisp, Pascal, Perl, PHP, Python, Ruby, Tcl/Tk,
for which ready-made ImageMagick interfaces (MagickCore, MagickWand, PerlMagick,
Magick++, PythonMagick, MagickWand for PHP, RMagick, TclMagick, L_Magick,
and JMagick) are available. This makes it possible to modify or create
images automatically and dynamically.