I tried following the tutorial but I got lost a couple of times so I couldn't follow it.
When you first equalise the images you save them as Ha and OIII, without saving as layers, that's fine, but the images are equalised when you save them, then it jumps to both images being layers(?) in a different image, with no equalisation set. Its confusing me. Also how did you create that image with the Ha and OIII layers, I mean, how come there is no background layer ?
Hi, sorry if you couldn't follow it, its tough to make the video easy to understand for everyone, let me try to explain it to you directly.
The equalization is never used as an actual stretch, its just to see what's there.
Basically what you want to do first is split the RGB image you got after stacking into two different images. One (the red channel) is the H-Alpha, the other (Green channel) is the Oiii. You then want to stretch these images separately. The goal is to have two stretched images that have roughly the same background brightness.
Then its time to put them back together. You can map these colors whichever way you want, there is no right or wrong here.
You have two images, but an RGB image has three channels. So you need to create a third "synthetic" green image. To do that you can simply take both Ha&Oiii and use them at 50% opacity (one is 100%, the other one, in the layer above, set to 50%).
Now you have three images. Say you want:
You start with the synthetic image. ctrl+a to select the entire canvas, ctrl+c to copy everything. Go into the channel selection of the blue image, click on the green channel and paste in the Synthetic image. Repeat this with H-Alpha and you have a full rgb image. This is likely going to look awful...the easiest way to balance the colors (in my experience) is with the channel mixer and the color balance tool. Once you found a decent balance, you can start adjusting the colors to your liking.
If you have bad signal to noise ratio, you can also use the h-alpha as a luminance layer. This isn't really the way it should be done, but it works either way. Just put it on top of the RGB image and set the blend mode to luminance.
I hope this helped