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Old 12-09-2010, 09:03 PM
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jjjnettie (Jeanette)
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jjjnettie is offline
Join Date: Feb 2005
Location: Far Far Away
Posts: 16,726
Thumbs up Coma Correction in CS3

I've just been given a really useful tip that I just HAD to pass on.
(many many thanks to my FB pal Charles Bell)

I'll walk you through it using one of my own images taken through my ed80.
First, Download the image of m31 (named "m31 with coma") that I have posted here and open in photoshop.
choose FILTER
choose DISTORT
untick SHOW GRID at the bottom so you can see the image better
go to the top slider REMOVE DISTORTION
slide it to the left to around -24
Voila most of the coma is now gone.
I've not gone indepth with this filter yet, but I'm suitably impressed with just this simple adjustment.
I hope some of you will find it useful.
Attached Thumbnails
Click for full-size image (m31-with-coma.jpg)
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Click for full-size image (m31after-lens-correction.jpg)
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