Thanks! Unfortunately I don't speak French. I ended up getting ok results with the HARVG script but I'm not convinced it is the most scientifically accurate approach.
I am working on the Pelican in HOS and tediously gathering 2-3 1800s images a night if weather permits. I'll go through the video and see what can be garnered.
What I get is that you have a lot of controls in their system. I think the basic idea is like with lRGB images. You put together an RGB image with good color but dubious detail. The get the best L you can and pop it in under (or over) the color so you get the fine detail colored by way you want from the RGB.
So I had some time this AM and these are their steps (quickly) from the 15 min video:
1. Try to equate the three images for background darkness and star size.
2. Open the script and create the L. Their suggestion is 100% H and 60% S. Try different "method" of mixing and look in areas where you want nice gradients.... you can try many different methods. They use "Light or Linear LIght" in the video. Hit the button to make the image and you can close the script.
3. Call the created image "L" and mess with stretching etc to get out the detail you want to get.
4. Rename the images L S H O.
5. Reopen the script and it finds the renamed images automatically, then you go to the bottom to the color Layer to Mixing. R=S at 100% G=H at 80% and B = O at 100%... in the video.
6. Then go up to the L-SHO controls and push the L button (Ever use PhD guiding... Push Here Dummy).
7. Et, comme on dit en francais: Voila!
8. Now there are lengthy French commentaries worthy of the Impressionists about getting color balance right, but not too much of one and not too much of the other... but the important point is that you can mix values from all three narrow band images into each of the three colors... mix and match (this is way cool) and I finally realized he is working on the Pelican also! Each time you push the button you see the new color mix.
9. Then, of course, you can push the R button to add the L. They have their own method for doing this using the check off box. The alternative unchecked seems similar to regular LRGB combo. Here I had trouble with the linear image and I think I have to get the L stretched earlier in the process.
10. The end of the video talks about how to reduce star color... need to listen again.... and states that if you do this linear you have to check all the boxes at the top to get the autoSTF... the video was carried out in stretched images and I think that says a lot about the optimal choice for this method. You can save you settings and load them for similar SHO images in the future.
Anyway, Vive La France!
