In article <nm8EOXFTD8R+DNvuTiKVKnuQNAlg@4ax.com>, Glen Berry 
<7no### [at] ezwvcom> wrote:

> There is a technique used in traditional photgraphic printing called
> "unsharp masking." This is *not* to be confused  with the same term as
> applied to Photoshop. The term used in Photoshop refers to a method of
> manipulating an image's sharpness. What I ame going to describe, is a
> method to control the tonal range or contrast of an image - not a
> sharpness adjustment.

This sounds like a very interesting feature, but one thing...


>  3) Blur the negative somewhat heavily. 

Is this stage necessary for a filter? It seems that it is only done in 
"real life" to avoid problems with slight misalignment or with film 
grain, these wouldn't exist in a computer generated image.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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