[Tig] Thin (underexposed) neg and dirt

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Fri Feb 13 18:08:56 GMT 2009

On Fri, 13 Feb 2009, Adrian Thomas wrote:
> ...but a completely meaningless number as spatial resolution is dependent on 
> wavelength! Don't forget that Bayer is a PSYCHOVISUAL technique - it's 
> designed to make good LOOKING images in an efficient way, not satisfy some 
> arbitrary 'resolution' criteria.

Most current imaging technologies take advantage of psychovisual 
techniques.  There are places for such techniques, and places where 
they fail miserably.

Given the interest in using 4K (or even higher) resolutions, it is 
wise to make sure that the content is accurate enough to justify use 
of such resolutions.  The cost of 4K is high.  If the actual quality 
of the content could be represented in 2K, then that cost is wasted.

The only valid way to evaluate the use of Bayer patterns in sensors is 
by performing real-world measurements in an entire system, which 
includes the lens, and necessary post-processing.  As you say, the 
results will differ for different sorts of scenes.

Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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