Re: [Gimp-user] Anti-Vignetting

2005-08-21 Thread Stephan Hegel

Hi all,

If vignetting is perfectly radial, panotools is easy to setup and use.
Bruno's tip with the gradient layer can fix even more difficult problems,
e.g. when too dark areas aren't radial. Needs a bit more effort, though.
Sven's idea sounds interesting but I haven't tried yet. I will keep this
in mind.

Thanks for all tips & kind regards,
  Stephan.
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Re: [Gimp-user] Anti-Vignetting

2005-08-20 Thread Sven Neumann
Hi,

Stephan Hegel <[EMAIL PROTECTED]> writes:

> Recently I had to deal with a couple of images with signifcant
> vignetting in the corners: they were a few % darker. So, I was
> looking around for an adjustable anti-vignetting filter for Gimp,
> similar like that one for "digikam". Any idea ?

What I ussually do with such images is to create a very blurred
version and use that as an overlay on the original image. With the
right layer mode (try lighten), this will fix the vignetting problem.


Sven
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Re: [Gimp-user] Anti-Vignetting

2005-08-20 Thread Bruno Postle
On Sat 20-Aug-2005 at 06:07 +0200, Stephan Hegel wrote:
> 
> Recently I had to deal with a couple of images with signifcant
> vignetting in the corners: they were a few % darker. So, I was
> looking around for an adjustable anti-vignetting filter for Gimp,
> similar like that one for "digikam". Any idea ?

There is the radial luminance filter in the panorama tools gimp
plugin:

  http://panotools.sourceforge.net/

..but you might prefer to simply create a new layer over your photo,
fill it with a radial gradient (black in the middle and white in the
corners) and set the layer mode to 'multiply' or 'lighten only'.

Then you need to adjust the opacity of this layer until the picture
underneath looks right.  For a more refined technique, follow this
photoshop tutorial:

  http://homepage.ntlworld.com/j.houghton/vignette.htm

-- 
Bruno
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Re: [Gimp-user] Anti-Vignetting

2005-08-20 Thread michael chang
On 8/20/05, Stephan Hegel <[EMAIL PROTECTED]> wrote:
> Hi all,
> 
> Recently I had to deal with a couple of images with signifcant
> vignetting in the corners: they were a few % darker. So, I was
> looking around for an adjustable anti-vignetting filter for Gimp,
> similar like that one for "digikam". Any idea ?

I'm not sure I understand the words in your description, but I believe
there was a 1.x plugin called "Homogenize" -- maybe it does what
you're looking for...?  If it does, maybe consider porting it to 2.x
if you know how. ^_-

-- 
~Mike
 - Just my two cents
 - No man is an island, and no man is unable.
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[Gimp-user] Anti-Vignetting

2005-08-19 Thread Stephan Hegel

Hi all,

Recently I had to deal with a couple of images with signifcant
vignetting in the corners: they were a few % darker. So, I was
looking around for an adjustable anti-vignetting filter for Gimp,
similar like that one for "digikam". Any idea ?

Kind regards,
   Stephan.
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