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Old 29-04-2016, 02:09 PM
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Paul Haese
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Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,991
Liberty, twisters and clouds

I finally got together all the narrow band data on this object over the last week or so. Total integration is 19 hours.

I have been trying to find a way to use narrow band data to produce RGB stars (as several other images do exactly that) and I think I have managed to get a reasonable facsimile. It involves a bit of trial and error but essentially I combine the Ha SII OIII to RGB. Then colour match the whole image to what it ought to look like in RGB. Then copy and paste this image onto the NB image and use lighten mode for blending mode. Finally use replace colour tool and highlight the red/orange stars and then adjust that colour to a more yellow colour. You can do this by selecting the stars only too and then just adjust the opacity.

Things that I find are missing using only NB data though is the luminance in the cloud data you get from using the actual luminance data. There is also the natural charcoal look to the sky which is missing and the colours of the RGB nebula which gives a pleasing look to all the gas and dust.

Click here for the larger resolution image.
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Click for full-size image (NGC3576 SII Ha OIII 420 300 420 1 cs final.jpg)
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