Moin ..
I e written the python-fu to to that.
If someone else is interested, just mail me.



On Monday 29 November 2004 22:25, Joseph Heled wrote:
> (I think this has been discussed on the list before, but not sure
> where/when.)
>
> What is the best way to achieve the following functionality -
>
>    Given two layers L1 and L2, I want L2 limited by it's distance
> from L1
>
>        Result  <-  L1 - MIN( MAX(L1 - L2), -20), 20)
>
> (This expression uses L1/L2 as placeholder for each pixel in all
> RGB channels)
>
> Options:
>
> A. Write a plugin
>
> B. Write it as a script-fu (not sure if script-fu can iterate on
> pixels, and what is the speed implication). And I hate scheme.
>
> C. Write it in python fu if I can compile it, but even though it is
> probably not as universally available as scrip-fu. Can I iterate
> over an image in python-fu?
>
> D. I know I can do it with 5 layers and overlay modes. write this
> as a script-fu. Not elegant and requires loads of memory for large
> images.
>
>   Layer   Mode
>
>   L1     Grain Merge
> 148     Darken Only
> 108     Lighten Only
>   L1     Grain Extract
>   L2     Normal
>
> (148/108 stand for a layer filled with gray pixels
> (148,148,148)/(108,108,108)
>
> E. Write a generic framework which allows any kind of expression(s)
> between layer(s)  (Only kidding ...)
>
> F. Anything better?
>
>
> -Joseph
>
>
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