Should I utilize Sii data for Crescent Nebula? If so, what are some good ways.

different methods

my personal favorite way is to make a blank image with the same dimensions as your greyscale image (and make the value for this blank image anything above 0)

simply type in something like 0.1 in pixelmath, turn on "create new image", and drag the Process onto your grey nebula image; this will make a new image, a blank dark grey image, with the same dimensions as the nebula image, and with a value of 0.1.

then, bring up Channel Combination, and, if you want a yellow image, for example, you put the nebula image in both the Red and Green channels, but use the blank in the Blue channel

this is simple color mixing logic: Red + Green = Yellow. Start the Channel Combination process.

(for getting a golden colored nebula, I recommend creating a yellow image to start with)

so now, open Background neutralization, make a Preview box in the background of your yellow nebula image, and apply the process

now you should be left with a yellow colored nebula with a dark grey background

all that you need to do now is to change the hue - you can do this with photoshop, or just mess with curves and an inverted luminance mask in PI (or many other ways)



This is my way, I'm not sure how many others do it. Most people just use the NBColourMapper script I think. I find that my method gave better results though.