Pixelmath Expression RGB (replace XXX with proportions)
qeSII = XXX
qeHa = XXX
qeOIII = XXX

R: max(max((0.2196*SII)/qeSII, (0.4510*Ha)/qeHa), (0.0078*OIII)/qeOIII)
G: max(max((0.0039*Ha)/qeHa, (0.9961*OIII)/qeOIII), (0.9373*(Ha*.25))/qeHa)
B: max(max((0.431*SII)/qeSII, (0.1216*Ha)/qeHa), max((0.8275*OIII)/qeOIII, (Ha*0.25)/qeHa))

Want to make monochrome narrowband images look like true RGB images? This past month, I captured the Orion Nebula with narrowband filters. In this video, I process those data using free software (Siril, Gimp and my sharpening tool), showing how I did it. My discord has the data if you'd like to follow along, or try to process it better than I did:   / discord  

Tim Hutchison's Presentation: https://www.youtube.com/live/cu76vNPq...
Doug from @AstroAF video on HDR Orion:    • AstroAF - HDR Processing The Great Or...  

For those interested, here is the gear I use (or equivalent; Orion has discontinued some of their products, so the equivalent skywatcher products are listed). Most of the links are Amazon Affiliate links. Thanks!

Skywatcher HEQ5 Mount https://amzn.to/3NVrVQi
Skywatcher 80mm F7.5 Doublet https://amzn.to/47mbfZi
ZWO EFW mini filter wheel https://amzn.to/48OxhoN
Optolong LRGB Filter Set (1.25") https://amzn.to/47r23Tw
Orion 0.8x Reducer https://amzn.to/47s64a4
USB RJ45 Cable for Controlling Mount https://amzn.to/4aPlIzu
Raspberry Pi to control mount https://amzn.to/48mTBWH
R Pi case with touch screen https://amzn.to/3HvdNKl
ZWO Autofocuser https://amzn.to/3Skg0hX

Link to Siril: https://siril.org/
Link to Sirilic: https://gitlab.com/free-astro/sirilic...
Link to Gimp: https://www.gimp.org/downloads/
Link to G'Mic: https://gmic.eu/download.html
Link to AstroSharp/AstroClean: https://github.com/deepskydetail/Astr...
Link to Starnet: https://www.starnetastro.com/download/




#astronomy #astrophotography #neuralnetwork #gimp #rstudio #photography #machinelearning #free #celestron #zwo

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