M31 (highlighting regions with Ha, processing with subtraction (Ha - R))
Posted: Sep 17th, 2025
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Technical Info
Telescope/Lens:Askar SQA 85 мм f/4.8
Camera:ZWO ASI 2600 MC
Mount:Ioptron HAE 29 C
Guide Scope:Askar 52 мм F4
Guide Camera:ZWO ASI 120 MM mini
Software: SharpCap 4.0, Siril, GraXpert
Exposure:
236 x 180" ISO/Gain: 100 - RGB
100 x 300" ISO/Gain: 100 - Askar D1 DUO (Oiii+Ha) 6 нм
Orange zoneLight Pollution:
Petushki Vladimirskaya Oblast, Russia
Sep 14th, 2025
20 h 8 m
1971
37
Pixel math in Siril was used to add narrowband H-alpha (Ha) data to the broadband RGB image. That is, the pure emission signal can be isolated from the Ha data by subtracting the continuum contribution, allowing Ha to be added to the image without altering the color balance. As a result, we obtain a large number of nebulae in M 31 that contain hydrogen-alpha.
Использована пиксельная математика в программе Siril для добавления узкополосных данных H-альфа (Ha) в широкополосное RGB изображение.
То есть можно изолировать чистый сигнал излучения из данных H...
I was planning to add hydrogen to my M33 using the same method, but I just haven't gotten around to it yet. By the way, the blue band (BB) has shifted toward blue in your version.
Comments
The BB didn't drift away—this is an attempt to make the colors more expressive with warmth and tone.
Thank you.
Thank you.
But there is a result in any case.
The H_alpha regions are well highlighted.
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