Friday, December 19, 2008

Macintouch - scanning tips

I'm reasonably good with a scanner, but I still appreciate these tips ...
Macintouch - Scanners

... Just to give an upper bound on the required resolution, standard 35mm film has a resolution of approximately 4000 lines per inch. Printed material is lower resolution, though I do not happen to know it off hand.

If you are scanning slides or negative, there is no point at scanning the film at more than 4000 pixels per inch; there simply is no additional information beyond that resolution.

For printing, a quick rule of thumb is the image resolution should be three times the printer resolution. If you have a 100 line per inch printer, then your image should be 300 pixels per inch after any size conversions (e.g. an image that will be 4x4 inches on a page should be 1200x1200 pixels for a 100 line per inch printer).

Note that on a typically 72 dpi monitor, the same image will only need to be 288x288 pixels)...

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