Ha! Thanks Crudus! I actually found out independently that Gimp has a setting in the preferences that has you do just that (hold a ruler up to the screen to calibrate resolution). I did that, and I'm finding that it's helped *enormously*. Photoshop has a similar setting, but it's not as user-friendly as Gimp's -- so I just typed in the resolution info that Gimp generated for me. Now turning off dot-for-dot (or clicking View Print Size in PS) actually does what it's supposed to!