(PHP 4, PHP 5, PHP 7) Set the color for the specified palette index

(PHP 4, PHP 5, PHP 7) Give the bounding box of a text using TrueType fonts

(PHP 4, PHP 5, PHP 7) Output image to browser or file

(PHP 4, PHP 5, PHP 7) Write text to the image using TrueType fonts

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get the index of the specified color + alpha or its closest possible alternative

(PHP 5 >= 5.5.0, PHP 7) Concat two matrices (as in doing many ops in one go)

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Create a new image from the image stream in the string

(PHP 4, PHP 5, PHP 7) Apply a gamma correction to a GD image

(PHP 4 >= 4.0.7, PHP 5, PHP 7) Give the bounding box of a text using fonts via freetype2

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Create a new image from file or URL