[Gimp-user] chromatic aberration

[David Gowers]

Given a sample image I can be more specific than the following:

1 Decompose the image into LAB channels.
2 Despeckle the AB channels (oilify with low exponent is also an option)
3 Recompose

On Tue, Mar 18, 2008 at 6:44 AM, Jeffrey Brent McBeth <mcbeth at broggs.org> wrote:
> On Mon, Mar 17, 2008 at 03:09:47PM -0500, Chris Mohler wrote:
>  > On Mon, Mar 17, 2008 at 1:39 PM, norman <norman at littletank.org> wrote:
>  > > I have been copying some old colour transparencies using my digital
>  > >  camera and most of the images produced suffer from chromatic aberration
>  > >  somewhere within them. I have tried to find some procedure to remove
>  > >  these blemishes but, so far, have not found anything I can get to work.
>  > >  All suggestions and how to get round the difficulty will be gratefully
>  > >  received.
>
>  Not having worked on this problem in particular, I don't really know.  My
>  first approximate guess would be to decompose the image into color channels
>  and apply deblurring filters on the seperate channels.  You should be able
>  to make reasonable progress with this as as a first order approximation;
>  "all" chromatic aberration is, is the different colors blurring different
>  amounts.
>
>  Jeff
>
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