wimvb Posted April 20 Share Posted April 20 Since astro darkness is all but gone up here, the moon is gaining, and clouds are obscuring it all, I have started to reprocess data from a few years back. Inspired by deep images posted here and in the deep field challenge, I've reworked my 2022 version of M51. This is 15 hours of data, captured at f/5.3 with my SkyWatcher MN190 and ASI294MM camera. Reprocessed, as always, in PixInsight. For H-alpha and red combination, I tried something new. I created an HaRR image with channel combination in PI, and colour calibrated that with the standard colour calibration process. Then I merged the red channel of this image with an RGB image. It took a bit of tweaking, but the result looks pleasing. The original version, which was all about the Ha regions in this galaxy, is here: 18 Link to comment Share on other sites More sharing options...
geeklee Posted April 21 Share Posted April 21 On 20/04/2024 at 11:50, wimvb said: For H-alpha and red combination, I tried something new. I created an HaRR image with channel combination in PI, and colour calibrated that with the standard colour calibration process. Then I merged the red channel of this image with an RGB image. It took a bit of tweaking, but the result looks pleasing. That's a great revision Wim - the Ha less prominent, but overall a step up in many areas. Interesting approach for Ha combination you've listed above, I will try and keep a note of this to try myself - thanks for sharing. My continuum subtraction attempts have been mixed - my latest one I ended up masking in the final step to help in the places I wanted it. A little unorthodox. Link to comment Share on other sites More sharing options...
wimvb Posted April 21 Author Share Posted April 21 59 minutes ago, geeklee said: Interesting approach for Ha combination you've listed above, I will try and keep a note of this to try myself - thanks for sharing. Thank you, Lee. I got the idea from Seti Astro on youtube. I didn't remember the exact steps, so I "winged it". Normally I would emphasize the H-alpha regions a bit more, but this time I went for subtle. 1 Link to comment Share on other sites More sharing options...
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