Thursday, 7 March 2013

Double Cluster

I have had a play with the Perseus image, producing a crop of the Double Cluster which is more pleasing. The main thing is to try and get rid of the orange sky, and do something about the odd colours with some of the stars. The brighter ones in particular have a purple/magenta cast which is dealt with simply by turning the saturation down. All this does is produce a large white or grey star, but it does look a bit better. A minus violet filter would be better in the longer term, or even better a true apochrmatic lens. Some 'stars' are pure red or aqua-these may be hot pixels or random noise. Stacking multiple images and dark frame subtraction would be needed to deal with these. However I am pretty pleased with the results.

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