[Gimp-developer] Blur tool darkens image?

[Jasper Schalken]

The bug report: http://bugzilla.gnome.org/show_bug.cgi?id=434279

On 29/04/07, Jasper Schalken <jasperschalken at gmail.com> wrote:
> > You could have a look at the matrix convolution filter code. (Be warned
> > there are some minor bugs concerning edge effects IIRC) but it will serve
> > as an introduction to the different ways of treating edge data.
>
> Is that "void convolve_region(...) {...}" in
> /gimp/trunk/app/paint-funcs/paint-funcs.c?
>
> It doesn't have many comments, so I'm not sure what its doing nor what
> a convolution matrix is. I thought it would be along the lines of "for
> each pixel in the region make it the average of all the pixels within
> a certain radius". However, that gives a box blur and it may be
> Gaussian instead.
>
> I think I will just put this in a bug report and let someone who knows
> have a look. :S
>