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I took the below image of the crab nebula over the past 3 days. It's 75 x 300sec exposures (25 each) through SII, Ha and OIII 7nm filters. Any suggestions on ways to improve colours, detail, contrast, stars etc. would be appreciated:  My first attempt at the crab |
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7.76
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| It seems to me that you clipped the shadows. |
2.41
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Hello Andy @Andy Wray I like the details you got from M1, its sharp and without being "oversharpened" ^^ Some few comments: In a general way: - you have clipped the sky background which is almost at 0% , you could try to maintain the sky background at values between 6% to 15% this will give a more natural look especially if you pay attention not to stretch too much this background - there is a residual gradient, from bottom to up, to handle at the very beginning of the processing in linear phase More specific to SHO : - you can do what you want with colours in SHO, for my personnal taste, there is perhaps too many green in your composition, but this is only my opinion ^^ I must admit that with M1, I prefer HOO composition - the same for the stars colours, especially in SHO, you could try to manage stars colours either with a few RGB acquisition or with a dedicated composition for the stars : with Starnet v2, it is very easy to separate this processing, even without RGB data, you may try something like : R: Ha G: 20%Ha + 80%Oiii B: Oiii with this you will get stars colours "more natural", even if you maintain a SHO composition for the nebulosity But as I said, you can do what you want, this is just to open you some doors that perhaps you haven't considered ;-) Clear Skies |
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11.04
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Jean-Baptiste: Many thanks! Very useful. I have fixed the rookie clipping mistake and have applied your other two recommendations. I particularly like the star pixelmath combination which I will use in future when I run out of time to do the RGB capture.  |
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| As above for stars use RGB. Also try adding the Ha data as a luminance in the pixinsight LRGB just uncheck the rgb, drag the settings onto your color image. The image should pop a little. Theres loads on option to adjust color on that function too. Play till you get an image you like. Your image is already great. |
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11.04
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OK, here was my final process of this based on above feedback:  Crab Nebula SHO using a cheap newtonian |
