Vela's Veil in RGB-HOO
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Vela's Veil in RGB-HOO
The Vela supernova remnant is embedded in the wider Gum Nebula. Even with the wide field of view of the AUS-2 Takahashi, not all the SNR is captured (and the enormous, diffuse Gum Nebula is barely touched).
This is a combination RGB+HOO image; although L and S exposures were available, they didn't add much, in my view.
I found it quite tricky to render the diffuse H-alpha satisfactorily -- there's just too much of it! That makes it easy to end up with a rather garish image in a combination wide-band/narrow-band composition, while pushing it down too much also suppressed the SNR.
I include straight RGB and HOO images, for comparison purposes *only* (they are both intermediate reduction stages that I happened to save, and are not fully reduced).
This is a combination RGB+HOO image; although L and S exposures were available, they didn't add much, in my view.
I found it quite tricky to render the diffuse H-alpha satisfactorily -- there's just too much of it! That makes it easy to end up with a rather garish image in a combination wide-band/narrow-band composition, while pushing it down too much also suppressed the SNR.
I include straight RGB and HOO images, for comparison purposes *only* (they are both intermediate reduction stages that I happened to save, and are not fully reduced).
SPECIFICATIONS
Telescope
AUS-2 Takahashi FSQ-106ED
Camera
FLI PL16083
Location
Heaven's Mirror
Date of observation
2020/12--2021/1
Filters
LRGBSHO
Processing
PixInsight, Topaz AI, Photoshop CS6
Credits
ian howarth/Telescope Live
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Comments
Looks great! To combine RGB+HOO, I guess you use some PixelMath magic (or formulas) to map them?
Hi Jarmo -- yes, exactly. Essentially, channel by channel weighted combination of RGB stars and HOO nebula, using PixelMath. I may write up a short "how-to"...watch this space...