[Digikam-users] Color Effects

[Andi Clemens]

I'm afraid they don't work fine, I just tested it:
http://img34.imageshack.us/img34/2659/compareddistortionfx01.jpg
http://img34.imageshack.us/img34/4974/compareddistortionfx02o.jpg

The first image is a direct compare, the second a difference overlay.
As long as we use a reduced version in the editor, I guess mostly all filters 
fail a little bit.
This is the same issue with the InsertText tool for example, it is always 
offset by 6-10 pixels.

So yes, fixing this will mean to use the real image data...

Andi

On Tuesday 30 June 2009 14:40:52 Gilles Caulier wrote:
> 2009/6/30 Andi Clemens <andi.clemens at gmx.net>:
> > Gilles,
> >
> > KDE3 version has the same problem, it never worked.
> > For me it is "logical" that a smaller image size must have a different
> > look when the same parameters are applied as to the full version.
> > Makes sense to me.
> >
> > See this video:
> > http://digikam3rdparty.free.fr/misc.tarballs/temp/colorfx.ogv
>
> yes, never tested this one. but, distorsion work fine with KDE3.
>
> The some color tools (not all) use neighbouring pixels. As preview and
> target image size are differents, result are not the same.
>
> The only way to fix it is to use real image data and rewrite editor
> tool preview widget with zomming capabilities.
>
> Gilles
>
> > If the issue is really the difference between preview and final image
> > size, then a lot of filters don't work correctly, not only ColorFX and
> > DistortionFX, but also sharpen, blur etc...
> >
> > Andi
> >
> > On Monday 29 June 2009 17:27:42 Gilles Caulier wrote:
> >> 2009/6/29 Andi Clemens <andi.clemens at gmx.net>:
> >> > I can confirm this, and also DistortionFX looks totally different in
> >> > the final image.
> >> > This might be because we use the preview image for the calculation
> >> > during user input, and apply those settings to the final, much bigger
> >> > image later. This might cause different looks.
> >> > I assume this is true for most filters then that use a preview image
> >> > (instead of the full size).
> >> >
> >> > Gilles,
> >> > could this be the cause?
> >>
> >> No. I have already found this issue, when code have been ported to Qt4.
> >>
> >> If i remember, KDE3 code don't have this problem.
> >>
> >> Gilles
> >>
> >> > David,
> >> > can you please open a bugreport on this? If no one already exists of
> >> > course.
> >> >
> >> > Andi
> >> >
> >> > On Saturday 27 June 2009 22:23:22 davidvincentjones wrote:
> >> >> I have been playing with 'color effects'  recently but find that the
> >> >> effect shown in the preview is vastly different from the effect set
> >> >> on the image. The 'find edges' I find useful for special purposes but
> >> >> the color shift that occurs once I click OK is very large and
> >> >> dificult to predict. Ver 0.11.0 on Ubuntu 8.10
> >> >
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