Pixelmath narrowband image output is just black

Dashweb

New member
I have been watching and processing for over a year, this is the first time I could not find an answer or tutorial when I am stuck.
I was away from the hobby for a few months, I uploaded the newest version PI 1.8.8-12.
I used WBPP and have 3 narrowband masters. When I try to combine them in Pixelmath, in any fashion, the output image a black image. Even just putting Ha in the red expression.
I think I may have forgotten a step, If you could let me know what the step I am missing is, or direct me to the appropriate video that may cover this problem, I would be grateful.

1664249076009.png
 
You combined the NB images but the output color space is set to 'same as target' which is a grayscale image. Change this to to RGB .... that should fix the issue.
 
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