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You would need to use the image integration process in pixinsight to create a master file for each colour. Add all of the red hot example and run image integration to output a single red file. Do the same think for each colour separately as well as the luminance.
Once you have all the masters, open channel combination process and select each master file as appropriate. The result is a colour image but don’t be surprised if it comes out green or red. You can fix this with some more processes.
If you haven’t already, google light vortex astronomy and you should find Kayron’s tutorials which are a good starting point gor Poxinsight. He has an easy to follow approach with screen shots so you can follow the steps.
Btian
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