Quote:
Originally Posted by miki63au
Did find in my PS has the 'Astronomy Tools' macro installed and has a violet halo reduce function. Here it is with a bit more OIII data added from last night.
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The extra data did wonders to the color balance.
That's the way to do it rather than replacing colors or changing ratios to taste. In a mapped SHO palette each object has a specific amount of Sii (red) Ha (green) and Oiii (blue). When the ratios are kept as per the raw data your stars will then have specific NB colors which is different from RGB stars. If your stars become purple it is because one of the color channels was streched more than the others. The correct way to balance a NB picture is to pick a background sky area devoid of nebulosity (doesn't matter if it has small stars) and use pixel math to get the same ADU across all channels. Then you have a good starting point. If you really want to get rid of the purple in your stars the most efficient way is to invert the picture (as purple will become green) and get rid of the green halos with HLVG in PS or SCNR in PI. Then invert again.