While XPM is a common enough image format, sometimes you want to work with industry standards, such as JPEG, PNG, or GIF (if you can't stop yourself). Welcome to gdk-pixbuf. gdk-pixbuf is a library for image loading and manipulation. It supports BMP, GIF, ICO, JPEG, PNG, PNM, RAS, TIFF, and XBM/XPM image formats, can render images to drawables, scale and composite images against various backgrounds, create pixmaps/masks out of images, and so on. PHP-GTK provides interface to some of the more common functions of the gdk-pixbuf library. Unfortunately, gdk-pixbuf support is not yet available on Windows platforms. gdk-pixbuf extension defines a GdkPixbuf class which is used to represent an in-memory image data. All operations on the image are carried out by invoking methods of that class.