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I am continually impressed by the performance of these GSO RCs. That is a highly detailed image of M83. Only a few years ago, only very expensive scopes and cameras would match that effort let alone better it.
Colour isn't there yet so a bit of Photoshopping techniques are required there but the data sure is there. Try HLVG by Rogelio Andreo to get rid of the green cast in the background or Russell Cromans Gradient Xterminator to balance out the background gradients (green and magenta). Then move forward with a correct base to adjust the colours of the galaxy with colour balance tool in Photoshop or whatever software you use. Shadows/highlights tool on the lassoed and feathered core selection is a good way to reduce the bright inner glow of a galaxy if gently done. Play with the sliders.
If you want any help with Photoshop just PM me and I'll walk you through the techniques.
Greg.
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