Actually, this will be quite possible with the "custom layer mode" I 
was cooking a couple months ago, and which I plan do revive to Gimp 
2.2 ..
As an effect that applyes to the layer itself,like the "dissolve" 
layer mode, instead of on combinations, it is doable there.

One will just have to write the effect (if he's writiing from scracth, 
here will be a handfull of pre-made custom layer modes)
ST=0; VT=V1; LT=L1 ,
 to mean that targets HSV are set to zero, self, and self, 

The RGBA values per pixel are kept unchanged by the Custom Layer Mode. 

On Tuesday 16 December 2003 17:40, Adam D. Moss wrote:
> [EMAIL PROTECTED] ( Marc) (A.) (Lehmann ) wrote:
> > However, the "layer effects" people want is (in my eyes) exactly
> > that: apply some saturation effect to a layer that you can later
> > change without loss of fidelity.
> And that'd be pretty groovy, and it'd work BECAUSE the
> layer effect is conceptually (and in reality) a separate
> processing step rather than an attribute of the data it
> applies to.  This is precisely how I see the layer mask
> versus the alpha channel.
> --Adam


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