M13 LRGB - May 2023. (Geof Lewis)

M13 LRGB - May 2023.

Revision title: GradX on both L and RGB

Another look at my favourite GC, M13 in Hercules. Tried to go a bit deeper with this one, by shooting 5m L subs and 3m RGB subs instead of my usual 120s for all LRGB. The sky wasn't very cooperative for the RGB data, so not as many subs as I'd intended, but the forecast isn't great and Moon will soon be starting to further brighten what is already now only astro twilight for my 52N location.

B

Title: Reprocessed

Description: I think the original was too blue and overstretched, so hopefully this version retains the red/gold stars better.

Uploaded: ...

C

Title: tweaked colour balance

Description: Reduced yellow/green tones a tad

Uploaded: ...

D

Title: Used PI(SPCC) for star colour calibration

Description: I asked a friend to run my stacked RGB data through Pi primarily to use its star colour calibration tool SPCC. The resulting star colours are far better than i could obtain ust guessing at different WB in ImagesPlus. He sent me a linear TIFF which I processed then combined with my separately process Lum data. This certain;y looks much more like the colours I'm seeing others produce of this stunning target.

Uploaded: ...

E

Title: Increased stretch on luminance

Description: Pushed the luminance stretch more in order to show more of the outer regions of the cluster.

Uploaded: ...

F

Title: Trying to control the horrible gradients

Description: Took the RGB into Affinity Photo to run GradX before back into IP for the rest of the processing and combination with Lum data.

Uploaded: ...

G

Title: GradX on both L and RGB

Description: Gradients on the L data were still impacting the LRGB image so decided to run the L through GradX too. Actually ran 4 iterations at Fine+Low, to gradually flatten the gradients. Seems to have improved the image allowing more of the outer halo to be revealed with a smoother transition to the background sky.

Uploaded: ...

Best Messier images
Clusters - Globular
Messier images

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Deep sky
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Backyard
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Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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Status	Advanced success
Started	...
Astrometry.net job	7988833
PixInsight job	RTWPO6QYAHMTLK4V64R7LJLJS6EKUYOY
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h41m40s.986
RA (top/left)	16h42m42s.663
RA (top/right)	16h40m44s.628
RA (bottom/right)	16h40m39s.606
RA (bottom/left)	16h42m37s.274

Dec (center)	+36°27′12″.30
Dec (top/left)	+36°35′23″.75
Dec (top/right)	+36°36′47″.75
Dec (bottom/right)	+36°18′56″.40
Dec (bottom/left)	+36°17′33″.83

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M13 LRGB - May 2023.

Revision title: GradX on both L and RGB

M13 LRGB - May 2023.

Revision title: GradX on both L and RGB

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Image Index:

Contribution Index (beta):

M13 LRGB - May 2023.

Revision title: GradX on both L and RGB

M13 LRGB - May 2023.

Revision title: GradX on both L and RGB

Equipment

Acquisition details

Description

Comments

Revisions

B

C

D

E

F

G

Sky plot

Histogram

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