JPEG or What Looks Good on My Computer Screen.doesn Print well?
Dot or Pixel resolution on a computer monitor can look good “on screen” but not print well as ink on paper. Pixels on a monitor don’t need as much definition to look good compared to dot line screens on paper. In order for printing to trick your eye into blending colors together (CYMK) or as a photograph, the dots have to be really tiny, almost subliminal. Computer images, on the other hand, don’t need such detail. Figure that the dpi (dots per inch) on a monitor in your graphics file will print at half their value on a printing press. So, anything below 250 dpi will look coarse without smooth lines. Offset printing uses from 150 to 200+ lines per inch, which translates into a minimum 300-400 dpi, 600 dpi is standard.