splain somethin to me, DPI vs resolution - Page 2 at DVinfo.net

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You say you want resolution? The whole world is watching these digicams.


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Old February 27th, 2004, 09:02 PM   #16
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Now you see why I would never use a zoom lens with film.

Jeff, you said film was 'rated' at 4000ppi. Off the top of my head I don't feel like translating that into line pairs but I was talking about film and not lenses.

Dots per inch is the ability of the printer and have nothing to do with resolution of your camera or scanner.

Pixels per inch determines how big your image is printed. So a 4k by 4k image printed at 1000 ppi will be about 4 inches wide.

If your printer can only print 300dpi, then it can't resolve those other 700 pixels in an inch.
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Old February 27th, 2004, 10:21 PM   #17
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Yes, by most accounts your printer needs to be at least 1200 dpi to produce photographic results. However, the file you print needs only be around 300 ppi (240 ppi to 360 ppi) to achieve photographic quality.

Under ideal conditions film can resolve more line pairs and produce larger files than I stated. But those conditions are rarely met by most amateur photographers. It requires very low ISO films, very expensive lenses, perfect exposure, use of tripod and mirror lockup etc. Then you need to be willing to spend thousands to purchase an 8000 ppi scanner. Since all of these conditions are rarely meet, the average film scanned won't even come close to 4000 ppi quality.
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