How to despeckle?

On Thu, 2009-12-03 at 14:39 +0100, Claus Cyrny wrote:

> I would recommend you to donwload & install the 'GREYCstoration'
> plug-in
> from the Gimp plug-in page. It does a much better job than the Gimp's
> own 'Despeckle'
> filter. After installing it, you can find the plug-in under
>
> 'Filters > Enhance > GREYCstoration...'
>
> For a start, I would set 'Strength' to maybe 25 or so & leave the
> other options as they are.

Thanks very much for the pointer. I went to the link you mentioned,
which advised me:

This plug-in has been superseded by the G'MIC plug-in for GIMP

I have downloaded G'MIC and unzipped it, but it's not clear how to
install it. I would guess that it should simply be copied
to /usr/lib64/gimp/2.0/plug-ins, but this procedure doesn't seem to be
documented anywhere. Or maybe it's better to copy it to
$HOME/.gimp-2.6/plug-ins . Or maybe something else.

The most promising looking tool, gimp-plugin-mgr, produces an error:

$ gimp-plugin-mgr --install gmic_gimp
gimp-plugin-mgr: can't read /etc/gimp/plugins.d/gmic_gimp.conf

It's a good idea to check before charging ahead.

BTW: How carefully are the plugins in the Gimp Plugin Registry checked
for trojans, etc?

Thanks - jon

Jonathan Ryshpan wrote:

> *BTW:* How carefully are the plugins in the Gimp Plugin Registry checked
> for trojans, etc?

Not at all.


Michael

Attached is a small fragment of a tiff file; it has a large number of
speckles, which I'd like to remove. The natural tool would seem to be
Despeckle, but it doesn't seem to do the job. In fact, as far as I can
see, it doesn't do anything.

What's the right tool to use? Or maybe I'm not using Despeckle right.

Any help much appreciated - jon

On Wed, 2009-12-02 at 02:56 -0800, Jonathan Ryshpan wrote:
> Attached is a small fragment of a tiff file; it has a large number of
> speckles, which I'd like to remove. The natural tool would seem to be
> Despeckle, but it doesn't seem to do the job. In fact, as far as I can
> see, it doesn't do anything.

Set image mode to RGB, Filter->despeckle->set Black level to -1 and
White level to 256. Set image mode back to indexed if you like. Works
fine.

-- David