split and channel recombine to fix chromatic aberation

[slackingCamel]

i have a colour image that was taken low on the horizon and the planets have got visible chromatic abberation.

I speculate that to fix a colour image with chromatic aberration i would need to split, align, and recombine the RGB of the image.

The split and recombine i understand and can do, but how would i align them accurately?

[msmythers]

You can use the ChannelMatch tool to move the individual channels without extraction. Here is a screenshot of the tool. This is the reverse of what you want to do but it shows the movement.  I had a good image and shifted the red and blue pixels leaving the green alone.

If you have CA in different direction in the corners of your image then you would need to separate the channels and use the StarAlignment tool. Use the green channel image as the reference and make sure to have Distortion correction turned on. Apply this to the red and blue channel images and then recombine. Most of the time the ChannelMatch tool will take care of the problem.


Mike

[slackingCamel]

thanks, i was experimenting with alignment, but it doesnt detect stars, its a pic of Jupiter and Mars in the same frame, hard to get stars, but i will keep at it.

[slackingCamel]

yep, the channel match will work to solve my problem, thanks very much.