In article <njUGOUFjcnSZ3qj34lbk51m8BluE@4ax.com>, Glen Berry 
<7no### [at] ezwvcom> wrote:

> How hard would it be to do something like the following?
> ...
> This gives a fairly close approximation of Selenium Toning.
> 
> Or maybe this?
> ...
> This gives a fairly close approximation of Sepia Toning
> 
> Or maybe even this?
> ...
> This gives a very wild posterization effect

Those would be quite easy to do...but not in color_matrix. They should 
all be possible with the specialized isosurface function idea though...


> I also wanted to ask if the values you are manipulating in your matrix
> are the raw unclipped values, or have they already been clipped? It
> might be handy to apply a matrix or a formula to either situation, for
> different reasons. The above effects are meant to work with values
> constrained between 0 and 1, but if I wanted to control image
> contrast, I would need to work with the raw unclipped valiues.

They are the raw, unclipped values. Maybe a clip_colors filter would be 
useful, so different versions of each filter don't have to be made.

-- 
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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