Combine layers with mask

Euripides

Hello Adam!

As a new mono user, I'm trying different ideas and approaches for my workflow. Between all those trial and errors, a thought crossed my mind - not sure if it is valid...

I have Sii, Ha and Oiii data and as you can imagine Oiii are really faint. I've attached pics of Ha and Oiii (Ha = 18h, Oiii = 22h).

Is it possible to use channel combination or pixelmath to combine those linear SHO data, while in Oiii using a range mask to include only the strongest signal areas (pic example)? 

BlockHead

Yes... but this is the same as black clip thresholding with NB ColourMapper (or any screening method).

You would not need to make a separate mask. 

I am assuming you want to color each channel... this is precisely what NB ColourMapper can do for you. Just adjust the Histogram of the OIII layer and raise its black point.

-the Blockhead

Euripides

Yes exactly! 

I've noticed that especially with the  NB ColourMapper (after watching Fundamentals and YT video) but as it seems, I hadn't played enough with the histogram there.

I'm gonna retry with the black point tip.

Thanks Adam!