image_crop in core/includes/image.inc

Crops an image to a rectangle specified by the given dimensions.

image_desaturate in core/includes/image.inc

Converts an image to grayscale.

image_get_info in core/includes/image.inc

Gets details about an image.

image_load in core/includes/image.inc

Loads an image file and returns an image object.

image_resize in core/includes/image.inc

Resizes an image to the given dimensions (ignoring aspect ratio).

image_rotate in core/includes/image.inc

Rotates an image by the given number of degrees.

image_save in core/includes/image.inc

Closes the image and saves the changes to a file.