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Trying to combine RGB  

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(@russ-telfer)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 5
October 11, 2020 15:46  

Apologies to start, complete newbie.  So stacked a set of Lights, darks, flats, dark frames from an OSC, using a Quadband filter.  Did two separate stacks, one with Ha extracted, one with OIII extracted.  Saved both as TIFF.  Then loaded both TIFFs back in using Combine RGB.  Won’t let me combine as the original stacked them as 2 different sizes 😕.  Went into photoshop and resized one, tried again but because PS ‘resamples’ to the new size, all the stars are screwed up as it doesn’t align properly.  What am I doing wrong or missing ?


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2674
October 11, 2020 17:17  

No problem being a newbie and I wouldn't say you are as you're already into narrowband extraction etc. 😉 You do the OIII extraction and process that result, then save it as fits. Same for Ha. Then you restart APP (or clear the data) and load in Ha and OIII and label them as such (multi filter processing) and go to the normalize tab (5) and normalize the light against each other. Then you click on "save normalized frames" and then you can nicely combine them.


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(@russ-telfer)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 5
October 11, 2020 17:26  

@vincent-mod brilliant many thanks 😊


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2674
October 11, 2020 18:24  

If you run into an issue, happy to help. Good luck!


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