Lagoon (M8)

[kaymann]

Celestron C9.25 - HyperStar (Tilt Adjusted and Culminated) f/2.2 (525mm)
ZWO ASI533MC Pro - Brightness (Offset) 10, Gain 105 (Unity 100), Cooled to 0°C
Askar 50mm Guide Scope - ZWO ASI290mm Mini
PHD2 - 3 Second (New Dark Library) & Recent Calibration
SC - (ASTAP - Plate solve, Center, & Sync), Live Stack, Save All, Master Bias Flat = Yes, Master Dark = Yes
ASTAP - Preprocess Stack Analyze 40% Reject Rate, Stack to Master FITS
Siril - Background Extraction, Photometric Color Calibration, Green Noise Removal, StarNet Starless Master and Star Mask, Asinh & Histogram Stretch on Starless, Starless Saturation, StarNet Star Recomposition (Star Negative Stretch),
Darktable - Copyright and minor contrast, export PNG

2023-06-16

Smaller20230617-142126-M8 NGC6523 Siril-DT-Starless-Star.jpg (199.34 KiB) Viewed 6020 times

[Menno555]

Very nice, I always like the center of this object.
One tip? The background is very dark here. I checked in Photoshop and it almost black with 1-1-1 (those are the RGB values).
I don't know Darktable but if you can see color numbers there (those numbers from 0 to 255), try to get the background somewhere in between 20 and 30. This will make it easier to look at and is more "natural" since it's never pitch black up there

Menno

[kaymann]

Thank you, I will try to remember that and my settings for Siril background extraction or histogram stretching may be the culprit. As there is so little non-nebula to select. I will work on that! I will also check my PNG as I compressed it down to kilobytes.

Thanks again!

Randall