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Old May 29, 2003, 8:10 PM   #1
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Default Resolutions for scanning photos

I am scanning a large number of photos taken with a 35 mm Canon SLR, mostly 3.5 x 5 or 4 x 6 prints--landscapes, people/events, flower closeups. My scanning software (TWAIN, with JASC Paint Shop Pro) gives me a choice of resolution in dpi. Is there an algorithm for what resolution I should choose related to what print size I want? Both time to scan and filesize are tradeoffs to using the higher resolutions, but I want to save enough info to give myself some flexibility later for printing. 200 dpi scans yield tiff files about 1.5MB, 800 dpi scans go up to 20 MB. Is there any relationship between this question and the discussion about 200-300 ppi required for printed images? I'm using tiff because I read that it provides a better image. I realize that using jpeg would save space, but not scan time. Will appreciate your advice. Incidentally, I'm not a digicam owner yet--but I'm looking! Thanks
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Old May 30, 2003, 6:58 AM   #2
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You certainly don't want to scan at less than your desired printing resolution (say 300 dpi). That will allow you to re-create your prints at a later date - at about the same size as they were when you scanned them in.
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