[sjastro]

Originally Posted by alpal

Steven,


Thanks - you can really see now where the signal was.
Interesting that you subtract to make masks.

cheers
Allan

It's very simple in PI.
Use pixel math to subtract the images, make sure the mask is registered with the main image and use a manual colour calibration command to work on the areas of interest.

Originally Posted by Merlin66

Steven,
That's amazing!!
Your efforts are well appreciated!

Thanks Ken.

Originally Posted by RickS

I really like it too, Steven. Good to see some new processing ideas.

Cheers,
Rick.

Thanks Rick. As you are a PI aficionado, I use the Assisted Colour Calibration command to work on the masked areas.
I'm sure the developers of this function in no way intended the function to be used as I am using it.
It allows me to accurately assign colours to the respective wavelengths.
OIII is blue green or cyan in colour, and Ha is deep red.

The challenge is to now add SII to the mix and assign a colour.
The most "realistic" colour for SII is a deeper shade of red which can be developed using the Assisted Colour Calibration command.

Clear skies

Steven