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The standard is device and line screen dependent. In other words- if art prints at 150 lines per inch -300dots per inch. 200lpi -400dpi etc. In the case of bitmap files, find out the resolution of the imagesetter- 1270 is a good bet for most printers. The cover of Time Magazine is 180 LPI, so use that as your rubrick. Most everything you're going to be encountering as a beginner will be printing (low) 85-100 LPI and (high) 150-170 LPi so 300 dpi is a good safe res to work at. Mitch