WolfieGlos Posted February 3 Author Share Posted February 3 Thanks for the input all. Well, I've had a few more attempts at processing thanks to the input of everyone, and this is the best I have come up with using Siril and GIMP. I've had to do several more steps compared to most, partly as I was being a bit more careful with the steps, but noise levels remain the biggest detractor when zooming in, however I feel this is definitely a step forward compared to what I had before. Without PI the only way I seem to be able to reduce noise effectively is more subs ! GIMP's noise reduction always destroys the stars when I use it, even masking them leaves them looking somewhat fake against the background with the overlap between them. But the only way I could bring out this level of blue in the galaxy was a separate layer with a blue curve adjustment, and then mask and brush it. If I applied it to the whole image, it looked very cold and the blue star halos were too obvious. Comments / observations / criticisms welcome 🙂 Siril: Crop (x=259, y=0, w=5363, h=3579) Background extraction (Correction: Subtraction) Photometric CC SCNR (type=1, amount=1.00, preserve=true) Asinh Transformation: (stretch=1000.0, bp=0.00000) Histogram Transf. (mid=0.035, lo=0.332, hi=1.000) Generalised Hyperbolic Transformation Saturation enhancement (GLOBAL amount=0.5) Cosmetic Correction Deconv. (iter=1, sig=1.522) Saturation enhancement (RED amount=0.42) -- EXPORT TO GIMP New layer with sharpen + contrast boost. Mask and brush to core. New from Visible. S-curve. Colour select for background "green noise". Noise reduction 7 and de-saturate. Darken shadows. New layer for contrast boost to core, mask and brush. New from visible. Darken levels. New layer. Increase blue curve, mask and brush to spirals. 1 Link to comment Share on other sites More sharing options...
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