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[OM] Re: Digital vs. Film discussions

Subject: [OM] Re: Digital vs. Film discussions
From: "Tom Scales" <tscales@xxxxxxxxxxxxxx>
Date: Tue, 17 Aug 2004 20:54:55 -0400
All absolutely true.  

The prints, however, speak for themselves.

Tom
----- Original Message ----- 
From: "W Shumaker" <om4t@xxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Tuesday, August 17, 2004 7:54 PM
Subject: [OM] Re: Digital vs. Film discussions


> At 10:40 AM 8/17/2004, you wrote:
> 
>>Because by the time you print, they're the proper 360dpi.  Photoshop CS 
>>can't create pixels, but it can use some pretty sophisticated math to 
>>predict them.
> 
> The print software is simply doing interpolation, which helps the
> printing process disperse the dots of ink on the paper. But the
> interpolation that is happening is not enlarging the picture. Rather it
> is just smoothing the square pixel boundaries. The interpolation that
> happens does not add detail that allows for a larger print size. It
> only smooths the existing edges of the pixels themselves. If you look
> at lines/mm nothing changes. Sampling has a limited frequency response
> and nothing can improve it unless it is creating fictitious data. the
> converging lines on a resolution chart that blur into gray cannot
> become lines again? Making crisp edges from blurry ones gives the
> impression of sharpness. To some degree you can say it pulls out
> information, but that information has to be there in the first place,
> and it is frequency limited by sampling. I think it is more a matter of
> the way we perceive. Crisp edges feel sharper so we percieve the image
> to be sharper. For example, why do some more grainy films seem sharper
> than some finer grain films? Is there more information, or is it a
> visual phenomon?
> 
> A friend of mine has a 256x256 watch camera. He has made some
> interesting pictures with it, even though it is only a 0.0625
> megapixels (yes zero.zero-six). It is our minds that are good at
> predicting visual information. Now that is sophisticated math.
> 
> \A/yne
> 
> 
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