Re: [Gimp-developer] c2g improvements

[Alexandre Génin <bellette tuxfamily org>]

> Out of curiousity, what is the relation of Marco's wavelet filters to
> local contrast? :)

Well I'm not an expert but my understanding of wavelet decompose is that it 
decomposes the image into different details scales. So if you duplicate the 
Wavelet scale xx layers after using wavelet-decompose, it will make the bright 
details at that scale brighter and the dark details and that scale darker, ie 
increasing local contrast. 

I don't know the relationship between the two, but I it looks very similar to 
increasing local contrast with unsharp mask, but with direct control over 
different radius. 

Maybe that's not what the filter is designed for, but in some cases I find it to 
do a pretty good job.

I made a quick&dirty xcf, that probably explains better than I do :
https://dl.dropbox.com/u/35934134/ex.xcf.tar.gz

> Could it be that GIMP simply hasn't entered optimization phase with
> regards to GEGL yet? :)

Well then I'm looking forward, keep up the awesomeness :) 

Alex

Le Sunday, June 03, 2012 10:33:50 PM Alexandre Prokoudine a écrit :
> On Sun, Jun 3, 2012 at 9:47 PM, Alexandre Génin wrote:
> > I use c2g on almost every photo : my workflow often only consists in
> > adjusting global contrast (levels/curves), and then using c2g for
> > adjusting local contrast, usually with different radiuses. It  a
> > fantastic tool, much better imho than all the wavelet-* filters that
> > always produce a 'dreamy' effect.
> Out of curiousity, what is the relation of Marco's wavelet filters to
> local contrast? :)
> 
> > The only drawback is that it takes ages to process the photo
> 
> Could it be that GIMP simply hasn't entered optimization phase with
> regards to GEGL yet? :)
> 
> Alexandre Prokoudine
> http://libregraphicsworld.org
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