Here are examples of the noise_pigment patch...the first image 
demonstrates the pigment itself, from left to right:
plain color
plain monochrome
gaussian color
gaussian monochrome

The second image demonstrates it's intended use, as a control pigment 
for post_process filters. It was done by averaging the pigment with the 
image, using the add and divide post_process filters.
And of course, this pigment is not animation-safe(unless you *want* 
shifting static), and anti-aliasing tends to muddy it up into a grayish 
mess.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
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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Preview of image 'NoisePigment.jpg'

Preview of image 'NoisePigment2PP.jpg'