Ruy wrote:
> 
> I've been through Christoph Hormann's radiosity tutorial and found the
> method of differencing pictures very useful as to check how different sets
> of parameters work when compared to eachother.
> 
> How is that differencing accomplished?
> 

It's done with Pain Shop Pro's Image Arithmetic, most other imaging
programs should contain similar functions.  After differencing, usually
contrast is increased.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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