Title: SH2-119 - The Clamshell Nebula
Description:
I was not happy with the colors of the first revision of this image. So I sit down again and spend a couple of hours with a different workflow:
1. Prepare the RGB, Ha and Lum images (DBE, a denoise the RGB, RGB color correction, sharpen Ha and Lum,....)
2. Remove the stars from RGB, Lum and Ha images. Keep the RGB stars for later.
3. Strech the RGB channel
4. Extract the red channel from the RGB (Channel Extraction), strech Ha to the same brightens as the red channel and combine red + Ha (factor *0.3) in Pixelmath.
5. Recombine the RGB with the enhanced red channel (Channel Combination)
6. Stretch the Luminance image to about the same brightness as the Ha and combine them per Pixelmath (Lum+Ha*0.5) = LHa
7.Extract the CIE *L + *a + *b (Channel Extraction) from the RGB image
8. Recombine the RGB Image (Channel Combination) with the CIE *LHa + *a + *b.
9. Strech the RGB Star image and add the stars back into the starless image using Pixelmath ( ~((~StarlessImage)*(~Stars)) )
10. Final adjustments before export to JPEG
I am really pleased with the more natural looking image (compared to the first approach).
Hope you like it as well.
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