Jargon busters
Dithering
a way of mixing patterns of dots of two colours to produce a third colour
DPI
Dots Per Inch. The more dots per inch, the better the definition of printed pictures etc.
PostScript
Adobe's page description language. A PostScript printer contains a small computer that 'runs' PostScript code, which is sent to it by the computer. The code contains the instructions that tell the printer how to draw the page.
QuickDraw
Apple's own imaging language, containing the commands necessary to draw anything on a Mac screen or non-Postscript printer.
