Drivers which produce output files are described in this chapter. Each of the drivers has a list of options, and these may be set as outlined in the Section called Command Line Arguments in Chapter 3.
The GD driver produces png, jpeg, and gif images, using devices by the same name. The GD driver is unicode enabled. Text is anti-aliased, but lines and shades are not.
The available driver options are:
optimise: Optimise PNG palette when possible
def_black15: Define idx 15 as black. If the background is "whiteish" (from "-bg" option), force index 15 (traditionally white) to be "black"
swp_red15: Swap index 1 (usually red) and 1 (usually white); always done after "black15"; quite useful for quick changes to web pages
8bit: Palette (8 bit) mode
24bit: Truecolor (24 bit) mode
text: Use driver text (FreeType)
smooth: Turn text smoothing on (1) or off (0)