Messier 100 and Nearby Galaxies (HaRGB) (Linda)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: IC 783 · M 100 · NGC 4312 · NGC 4321 · NGC 4322 · NGC 4323 · NGC 4328 · PGC 1490473 · PGC 3090631 · PGC 3090632 · PGC 3096132 · PGC 39935 · PGC 39941 · PGC 39948 · PGC 39956 · PGC 39997 · PGC 40002 · PGC 40044 · PGC 40045 · PGC 40068 · PGC 40083 · PGC 40130 · PGC 40159 · PGC 40171 · PGC 40184 · PGC 40214

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Messier 100 and Nearby Galaxies (HaRGB)

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Messier 100 and Nearby Galaxies (HaRGB)

I finally got to image M100 this yea and actually ended up getting almost twice as much data as I had intended. It turned out to be a happy mistake (who ever complained about too much data?!).

Here's how I processed it:

each r, g and b:
dynamic crop

H:
dynamic crop
deconvolution
DBE
generalized hyperbolic stretch
starnet2
tgv denoise
curves for contrast

RGB:
channel combination
dynamic crop
deconvolution
DBE
PCC
generalized hyperbolic stretch
starnet2 (creating stars)
tgv denoise
LHE (2 scales)
NBRGBCombination in Ha
curves for contrast
MLT sharpening
pixel math in stars

I didn't feel the need to do star reduction. When adding in the H, I used a very low scale setting in NBRGBCombination so the H contribution is actually quite low here. I just wanted a hint of it as it wasn't showing HII regions but a general H-alpha glow along the spiral arms. When combined it didn't really add much but a reddish cast. I kept just a hint of it in the final image. The contribution is most evident in the core.

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Status	Advanced success
Started	...
Astrometry.net job	5629954
PixInsight job	7Y6WZS8696B454XI662Q5FAC1IKPG1ZK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h22m53s.451
RA (top/left)	12h24m32s.825
RA (top/right)	12h21m11s.672
RA (bottom/right)	12h21m14s.355
RA (bottom/left)	12h24m34s.882

Dec (center)	+15°44′03″.84
Dec (top/left)	+16°05′52″.20
Dec (top/right)	+16°05′14″.20
Dec (bottom/right)	+15°22′10″.63
Dec (bottom/left)	+15°22′49″.74

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Messier 100 and Nearby Galaxies (HaRGB)

Messier 100 and Nearby Galaxies (HaRGB)

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Messier 100 and Nearby Galaxies (HaRGB)

Messier 100 and Nearby Galaxies (HaRGB)

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