LRGB Colour Calibration in Pixinsight

3 replies•383 views

Topic starter

Feb 8, 2023

Getting the colour right in LRGB images is a bit of a dark art imho so I'd be interested to hear any thoughts on best practices or useful tips and tricks.

Obviously you can look at other published images for guidance but I always do that with caution.

Any thoughts would be much appreciated.

Well written Respectful Engaging

Pistachio_Enjoyer

Feb 8, 2023

Try SPCC. To use it first, you'll need to download the Gaia data from the PI website. Then after setting Gaia to read from a set directory, ensure that your image has a correct solution (i.e. its plate solved, you can use image solver for this). Then in SPCC, you can enter your sensor's QE curve (its a drop-down list of selections), your filters, etc.

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IrishAstro4484

Topic starter

Feb 9, 2023

Try SPCC. To use it first, you'll need to download the Gaia data from the PI website. Then after setting Gaia to read from a set directory, ensure that your image has a correct solution (i.e. its plate solved, you can use image solver for this). Then in SPCC, you can enter your sensor's QE curve (its a drop-down list of selections), your filters, etc.

*** Thank you. I'll definitely try that ***

jewzaam

Perfect post

Feb 9, 2023

+1 to SPCC, don't dismiss PCC though. I've had at least one data set (older) where SPCC wasn't happy with it but PCC had no issue.

You mention LRGB, generally you'll run SPCC/PCC on the RGB image while linear. If you have L this is best combined after color correction and after stretching. Not sure what all apps call it, but in PixInsight you'd use LRGBCombination process. And if you didn't capture L specifically you can extract L and use that instead. It's better than _not_ doing LRGBC at all in my opinion

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