Chromatic aberration

[legoman]

Hi Folks, Just bout my first mac. Loaded photoshop elements which came with it. Took new digiscope equipment to take supper photos of Puffins on cliffs at a range of 100 metres. Got home to find ghosting on margins where black and white colours meet. Searched web to discover this is chromatic aberration caused by my use of digital camera shooting through spotting scope.

It would appear photoshop elements does not fix CA so need advice as how to proceed........

 

[srf4real]

Elements does have a CA compensation feature, in its Adobe raw developer.
It's found under the lens corrections subset. I don't know how well it works
tho, my Olympus lenses don't do much of that. Were you shooting jpegs only?

If all you have is the jpeg (camera software processed image) you might try
blowing up the image to 400% and select the color fringing with magic select
tool, then desaturate or adjust color until you make some progress... much
more tedious. Not sure there may be a better way, other than shooting
in raw mode or avoiding poor quality glass in front of the image sensor.

Any one else have some ideas!

 

[legoman]

thanks

was not shooting in raw. I will try your suggestion and report outcome thanks

 

[compuwar]

was not shooting in raw. I will try your suggestion and report outcome thanks

That's not going to change your results, CA is an optical issue, and you're using optics which aren't designed to work together (camera lens, scope) so you're going to get the results you're getting if you don't spend lots of money on optics.

http://en.wikipedia.org/wiki/Chromatic_aberration

 

[legoman]

problem still unresolved

Thanks for the comments. I understand the cause of the CA. I knew with the limited budget I have this would be a problem. But from a correcting point of view what is the best way forward seeing as elements has not got the CA correction. I have had the pics made much better by someone with the full version of photoshop but I do not have that sort of funds for future pics I take. I have just forked out £1000 for this nice new Imac 24.

 

[ChrisA]

Thanks for the comments. I understand the cause of the CA. I knew with the limited budget I have this would be a problem. But from a correcting point of view what is the best way forward seeing as elements has not got the CA correction. I have had the pics made much better by someone with the full version of photoshop but I do not have that sort of funds for future pics I take. I have just forked out £1000 for this nice new Imac 24.

If you need free software use Gimp. There are several methods to fix your problem
http://www.farcrydesign.com/GIMP/PurpleFringe.html
http://home.comcast.net/~mdlarson/CA_testv2.html
http://kcd.sourceforge.net/fix-ca.php

Gimp is actually a rather crude method. If you want a method that should do as good as possible you want to be using this. But be warned it is not "dumbed down" for consumer use. This is fairly powerful and also free
http://hugin.sourceforge.net/tutorials/tca/en.shtml