In article <t0iegs0o3sm0ebto2qcv84npae607v7mfc@4ax.com>, Peter Popov 
<pet### [at] usanet> wrote:

> Glad you implemented it. Its purpose is to control contrast while the
> divisor is used to control brightness (generally speaking). It is
> expecially useful if the divisor differs from the sum of the cells of
> the convolution matrix. For example this:
> 
> <0,1,0,
>  1,5,1,
>  0,1,0>
> 
> will make a slight blur with a divisor of 9. If you lower the divisor,
> the image gets brighter. Adding an offset of about 0.8 puts the
> brightness back to about where it was but with a much increased
> contrast. It works in the reverse direction, too, with a higher
> divisor and negative offset.

Ah, I see now! I hadn't thought of using it along with the divisor... 
Thanks for the suggestion.

-- 
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/
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