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Old 30-11-2013, 10:11 AM
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gregbradley
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Join Date: Feb 2006
Location: Sydney
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Which ones were they Stefan? I think Topaz have a sharpen program.

Where I find decon useful is not in Photoshop at all. But at the beginning stages of image processing in CCDstack. I often do a 15 to 25 iteration Decon on luminance and save it separately. If its a galaxy type image I will do perhaps 2 more until I am starting to get artifacts around the stars (that varies with the image but usually around 30-40 iterations).

Then I blend them or combine the decon luminance to make a sharper luminance that I use in the LRGB combine.

I also sometimes do mild decon on RGB to tighten them up if seeing was poor or one colour stars are a lot larger than the others. This can reduce haloing of one colour on stars. Marcus Davies came up with that technique. It can be quite useful at times and heads off a processing challenge with coloured rings on bright stars.

I would not use decon on a colour image as its too destructive and counter to colour. Colour has gradualtransitions of colour change whereas luminance has sharp transitions of shade giving detail.

So applying decon to a colour image may be harmful to the image. Like in any image processing a little may work but a lot will look bad.

Greg.
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