Using ImageMagick

ImageMagick is a tool for generating and graphically editing images directly from PHP.

It can be used on Blueboard.cz hosting in two variants.

Using the PHP class Imagick

All instructions and documentation can be found in the PHP manual for this class.

Using the convert command from the command line

Used by calling the exec function with the convert command:

<?php

exec("convert rose.jpg rose.png");

Again, you can use the existing manual.