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Digital sharpness?
Old 05-22-2007, 08:23 AM   #1 (permalink)
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Hey guys, quick question,

I was trying to explain to a friend of mine about why digital camera images, right out of the camera, won't be as sharp as, say, if you shoot the same image -- and assuming you use the same lens, your focus is perfect, etc. -- on film. I know there's a technical reason for it, but I can't remember what it is. Anybody care to explain this to me? Thank you!

Sam
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Re: Digital sharpness?
Old 05-22-2007, 09:29 AM   #2 (permalink)
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More than you'll ever need to know can be found on Norman Koren's site: http://www.normankoren.com/Tutorials/MTF7.html

Happy reading!
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Re: Digital sharpness?
Old 05-22-2007, 12:15 PM   #3 (permalink)
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Thanks Scott, I'll check it out!
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Re: Digital sharpness?
Old 05-22-2007, 09:28 PM   #4 (permalink)
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I always thought it was, ultimately, that the number of pixels in any digital sensor is smaller than the size of the light-sensitive crystals/complexes that form the color-developing center of a piece of film, coupled to the finite number of color gradiations available in a digital sensor versus the essentially continuous gradiations available in the analog media of film.

Or magic. Yeah, that works, too.
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Re: Digital sharpness?
Old 05-24-2007, 07:14 AM   #5 (permalink)
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Because an anti-aliasing filter in front or the CCD (or CMOS) filters out high frequencies.

This filters avoids moire, unwanted patterns artefacts that would otherwise show up whenever you shoot something like fabric, foliage, etc...

The filtered out high-frequencies are producing a softer final image.
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