I've got a Laserjet 1100 here, and under Windows it prints things like photos and other such dithery stuff wonderfully, with barely a trace of dottiness.
While magicfilter does a good enough job for text, its graphics performance is shocking. It's like it's doing it at 150dpi. I'm stuck with the Laserjet 4L driver, as there's nothing later there. I tried apsfilter, but it seemed the same, roughly, and the Laserjet 5L driver didn't work. I expect a Laserjet 6L driver would work (it's the same engine, I think) but I can't find a filter for one anywhere. Can't I print better quality than this from Linux?