On Wed, 13 Dec 2000, Greg Kettmann wrote:
> Could someone please clarify resolutions. I have a scanner and a
> digital camera (and of course a regular camera). Now 300DPI is pretty
> self explanatory. My digital camera is something like 1280x1024.
> That's fine but lacking a measurement it's meaningless. What is the
> equivalent DPI measurement? If that's for a 1" picture it's great but
> if it's for and 8x10 it's not so good. Is it standardized and if so
> what is the default picture size (which of course would yield the DPI as
> well).
The DPI of a digital photo depends on what size you print it at. A
1024x768 image, printed on a photo-quality printer to a 4x5 inch page,
looks as good as a standard 4x5 photo. Print that same image at 8x10
inches, and it comes out blurry. A 2048x1536 image, on the other had,
comes out great at 8x10 inches.
> Now for the really tough question. What is the approximate resolution
> of a standard photograph?
A $500 HP negative scanner scans at up to 2400 dpi, yielding an image
approximately 3000x2000. Polaroid has a higher-end scanner that they claim
scans at 4000 dpi. I believe a print from a typical photo lab tends to be
less than this. The current crop of 3.3 megapixel cameras give a 2048x1536
image, which I find rivals what I get from film.
--
John Abreau / Executive Director, Boston Linux & Unix
ICQ#28611923 / AIM abreauj / Email [EMAIL PROTECTED]
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