So this is fixed in cvs? For the tool, plugins, or both?

On 27/04/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> On Thu, 26 Apr 2007 18:47:42 +0200, Sven Neumann <[EMAIL PROTECTED]> wrote:
>
> > Hi,
> >
> > On Thu, 2007-04-26 at 12:38 +0200, [EMAIL PROTECTED] wrote:
> >> I said some time back that the use of gint() rather than round is
> >> fairly indemic in gimp and is an area that needs following up.
> >
> > Yes, and I said in response that we are well aware of the fact that a
> > lot of the algorithms used in GIMP just plain suck and that there's a
> > lot to do all over the place.
>
> It's not the algorithms that suck (to use your term) it's way it's coded.
> Not the same thing.
>
> Now what's your point in repeating that
> > over and over again? Please point out specific problems and, preferably,
> > come up with patches.
> >
>
> Over and over , I think not. I repeated it here since you were suggesting
> this sort of thing was unavoidable and saying it was the algorithms. I
> disagree, so I explained why.
>
> >> > What you describe sounds like a very artifical test.
> >>
> >> That is a comment that you often put forward in replies to bugs but it
> >> is
> >> necessary to develop specific test cases to pinpoint and quantify a
> >> problem.
> >
> > Artificial was the wrong term to use here. Sorry about that. What I
> > meant to say is that the proposed test is not well chosen since it
> > doesn't test the problem pointed out here. Instead it focuses on the
> > behavior at the image border which is a different problem.
> >
> >> I described a large image not affected by border issues and posted a
> >> histogram showing the mean 112 grey level . Since it is not too
> >> disimilar
> >>  from your test case it's surprising that the results are so different.
> >
> > I couldn't reproduce your test, probably because you didn't provide all
> > parameters (like for example the blur radius). But I think it suffers
> > from the same problem. In order to blur two large areas in a way that
> > yields a single (almost) solid colored area, you need to use a large
> > blur radius. Your test image is then small compared to the blur radius
> > and again you are mainly looking at the border behaviour.
> >
> >> Maybe you could post your test image somewhere so that we can compare
> >> the
> >> results and see why there is a clear difference.
> >
> > Any image with a test pattern that is smaller than the blur radius will
> > do. You can use the Stripes pattern or create a pattern using the Grid
> > or Checkerboard plug-ins.
>
> >
> > I have reduced the rounding errors in our blur plug-ins today. The
> > results are a lot more stable now, even after multiple iterations.
> >
> >
> > Sven
> >
>
> Excellent work! I just reran my test case (which was centred on the b/w
> boundry in the middle of the image) and it works almost perfectly after a
> very large number of reps.
>
> Now the mean grey values are 129.9 , a very credible result for 8bit
> processing.
>
> The gimp now has a much better implementation of the gaussian blur
> algorithm. Great news.
>
> and thanks to Jasper Schalken for bringing up the whole blur darkening
> issue.
>
> /gg
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