Re: chromatic aberattion

Posted by Gabriel Landini on Jun 14, 2008; 10:17am
URL: http://imagej.273.s1.nabble.com/chromatic-aberattion-tp3695678p3695680.html

On Friday 13 June 2008, Tomáš Procházka wrote:
> I maybe solved first part of problem.
>
> with this
>
> run("RGB Stack");
> run("Scale...", "x=.99919 y=.99919 title=Untitled");
> setSlice(3);
> run("Scale...", "x=0.999 y=0.999 title=Untitled");
> run("RGB Color");

Hi,
Yes this may work nicely, but note that there is a limit of the accuracy of
the Scale command. I do not think that you will be able to scale the plane by
less than 1 pixel steps (i.e. target plane size/current plane size will be
stepped will be limited to the corresponding nearest 1 pixel values).

There will be a also limit to what one can correct as not all the colours will
be present in a unique rgb plane.

I wonder if scaling the image x2 and using interpolation, align and scale back
to 0.5) would make any difference (as it would allow to position the planes
at 1/2 pixel locations of the original image). Not sure if this would be
useful or just blur the original.


> But now I need detect edge, smooth, create mask from image and remove
> fringe under mask.

I do not understand what you mean here.

Regards,
G.