    class
    	EV_PNG_FORMAT

    General
    	cluster: interface
    	description: "Portable Network Graphics (PNG) Graphical Format Abstraction used by {EV_PIXMAP}.save_to_named_file"

    Ancestors
    	EV_GRAPHICAL_FORMAT*

    Queries
    	color_mode: INTEGER_32
    	scale_height: INTEGER_32
    	scale_width: INTEGER_32

    Commands
    	set_greyscale
    	set_paletted
    	set_scale_height (a_height: INTEGER_32)
    	set_scale_width (a_width: INTEGER_32)
    	set_truecolor