Dmack1 Posted November 29, 2020 Share Posted November 29, 2020 When I looked at yesterdays HOO Soul I decided I really did not like it very much. Too harsh, oversaturated, over sharpened.So I went back and started from first principles using the Ha-Oiii colour algorithm from APP (instead of the separate extract Ha and extract Oiii) and tying to keep it a bit more toned down. I used starnet to remove the stars to allow better control and kept saturation down.The result is softer, less contrasty and (at the moment anyway) I think it is better overall - maybe a little too soft.Thoughts?https://cdn.astrobin.com/thumbs/B4x600oxSwUv_16536x16536_JXczOqwr.jpgPrevious versionhttps://cdn.astrobin.com/thumbs/QAw464UULoOe_16536x16536_JXczOqwr.jpg 2 Quote Link to comment Share on other sites More sharing options...
Gina Posted November 29, 2020 Share Posted November 29, 2020 The newer version shows more of the fainter nebulosity and is certainly better. You could probably increase the contrast a bit but be careful not to lose the fainter nebulosity in the middle. I feel you have taken the black level too low in the first version. Hope that helps. 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted November 29, 2020 Share Posted November 29, 2020 IMO a huge improvement over the original, although there seems to be a lot of artifacts in the orange of the second image, that were not present in the original. Quote Link to comment Share on other sites More sharing options...
Dmack1 Posted November 29, 2020 Author Share Posted November 29, 2020 Posted by: @Gina The newer version shows more of the fainter nebulosity and is certainly better. You could probably increase the contrast a bit but be careful not to lose the fainter nebulosity in the middle. I feel you have taken the black level too low in the first version. Hope that helps.Thanks Gina, it really helps to hear what folks think - if ind it very difficult to know what is good or bad really So what I have done is to merge the two images 50/50 in Pixinsight to try to keep the best of both.How do you think this looks? 1 Quote Link to comment Share on other sites More sharing options...
Gina Posted November 29, 2020 Share Posted November 29, 2020 Sorry, but I don't think that has quite worked. You seem to have lost some of the nebulosity in the middle of the nebula. Keep the black level and increase the gain. Use HistogramTransformation on your second image to brighten it up. Watch your black level. Play with i until you get what you like. 1 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted December 11, 2020 Share Posted December 11, 2020 Definitely more nebulosity in the soft version. I think the combined is getting there, just needs a few tweaks. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.