Some Mars proccessing help

I was wondering if someone could tell me whats the deal with the blue around the polar cap. The image was taken with a SAC7 color camera so I dont see how the RGB wouldn't be aligned. No matter what I do so far the blue is there. Thanks.

Attached Image:

Hi Brian -

It's not your camera, it's the atmosphere. Image through a thick hunk of it (ie 30-40 degrees up where Mars is positioned for mid-northern latitudes) and atmospheric dispersion will spread apart the focus position of red and blue light as you see in your image. Much of this (though not all) can be magically corrected in Photoshop by adjusting the RGB channels. You will be nudging the position of the blue channel down and the red channel up to realign them. See my post a few messages back in response to Angel Gomez's image.

good luck
Alan Friedman