I have a document that I need to print in as high a resolution as possible (I'll be printing to a file, so hardware limitations are irrelevant), but the existing PCL drivers that I'm using only appear to go up to 300 DPI.
How can I configure a driver to print at something much higher than that, for example, 1200 DPI?
It's going to depend on the printer driver you are using. Since you are going to file you can probably pick pretty much any printer driver you want.
I did some testing and the HP Universal Printer Drivers (as an example) will go up to 600DPI when used with a file (they claim 1200DPI, but it's not actually available).
You can get the 32-bit version of the HP UPD here.
One of our B&W laser here is a Brother 1650DN, and it supports up to 1200 DPI. If I use its driver for a new printer that prints to FILE: I can pick 1200 DPI -- so there are drivers out there that'll do >300DPI, you just have to find one that works. :)
Also, ensure that whatever you're printing is in a resolution that high, or you're just printing a 300 DPI (or worse, screen DPI of like 72) at 1200DPI, so it'll look the same even with the higher output DPI.
