output: pngout
This output driver is used to output to a png file on disk. Its main usage
is debugging, but it can be used for other things too.

Options:

* width - the width of the image written to disk, in pixels
Example:
    width = 640

* height - The height of the image written to disk, in pixels.
Example:
    height = 480

* file - The filename of the image to be written to disk.
Example:
    file = /tmp/lcd.png

Driver written by Sprite_tm