filter preview dialog

Boudewijn Rempt boud at
Tue Jul 19 09:02:52 CEST 2005

On Tuesday 19 July 2005 08:55, Cyrille Berger wrote:
> On Tuesday 19 July 2005 08:31, Boudewijn Rempt wrote:
> > Which Gimp filter is this, by the way? It seems to me I don't know my way
> > around the Gimp as well as I did only a few years ago.
> Filter > Blur > Gaussian Blur..., it's the only filter I saw in the gimp
> that use the n*m convolution, Photoshop has a lot more of them. but anyway 
> 3600*3600 is unrealistic, it would take a lot of time to compute such a
> convolution.

Especially with the current convolution code. I had to rewrite the convolution 
painter a lot because I couldn't get the old code to work reliably in all 
conditions -- it was too complex for my little brain. The new code doesn't 
have all the optimalisations.

> The usual size is 10x10, I sometime use 100x100, but it's for special
> occasion.


> > Ah, that will probably be a little too much for a simple CDATA section
> > then --
> Anyway I don't realy like the idea of having binary data stored in a text
> file.
> > and at those sizes I think there's a benefit to using a tiled
> > KisPaintDevice.
> Why ?

With 3600x3600, that's almost 50 mb of memory you need, and that's where 
Bart's nice, caching, optimized tile engine works best.

Boudewijn Rempt
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