Re: [Gimp-developer] Problem with GIMP 2.2.8 despeckle plugin

[geert jordaens]

Pasi Savolainen wrote:


Hi,
I'm trying to find a median filter for GIMP and have been having some
difficulties. From what I've gathered with google, despeckle plugin is
the one that I should look at.
I think that it should be ran in non-adaptive and non-recursive mode
with white/black points se to maximum. But when it's ran with those
settings it doesn't produce what I expect.
Here's an image:


I can't tell if it's a bug or not as I don't know exactly what despeckle
should produce.

Produced result is also different depending on whether the layer is
bottom-most or not.


Thanks,
 


check-out bug report
*Bug 72862:* Incorrect RGBA resampling in Despeckle plug-in this 
describes the last functional changes

and some reflections on the white and black levels.
If you give a radius of 5 the filter will workon 121 pixels and select 
the pixel with the

median pixel intensity (RGB).

Geert

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Re: [Gimp-developer] Problem with GIMP 2.2.8 despeckle plugin

[Alex Fernandez]

Hi Pasi,

> I think that it should be ran in non-adaptive and non-recursive mode
> with white/black points se to maximum. But when it's ran with those
> settings it doesn't produce what I expect.
> Here's an image:
> 
> 
> I can't tell if it's a bug or not as I don't know exactly what despeckle
> should produce.

I don't know either, but it does not look right to me. From the web page
  http://www.easysw.com/~mike/gimp/despeckle.html
and documentation it should perform a plain median.

I have tried with another (home-grown) median filter and it gave
similar results to your "mogrify -5". Maybe operation of despeckle is
more complex than a plain median.

Alex.
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[Gimp-developer] Problem with GIMP 2.2.8 despeckle plugin

[Pasi Savolainen]

Hi,
I'm trying to find a median filter for GIMP and have been having some
difficulties. From what I've gathered with google, despeckle plugin is
the one that I should look at.
I think that it should be ran in non-adaptive and non-recursive mode
with white/black points se to maximum. But when it's ran with those
settings it doesn't produce what I expect.
Here's an image:


I can't tell if it's a bug or not as I don't know exactly what despeckle
should produce.

Produced result is also different depending on whether the layer is
bottom-most or not.


Thanks,
-- 
   Psi -- 

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