Messier 13 L-RGB Combination of two sets of data (Daniel.P)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Great Cluster in Hercules · Hercules globular cluster · M 13 · NGC 6205

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Messier 13 L-RGB Combination of two sets of data

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Messier 13 L-RGB Combination of two sets of data

This is my first LRGB combination.

I use my recently acquired image of M13 in 15 minutes total exposure for the Luminance channel (APO 130 FD6.6 & ASI 1600) and the old 2016 data for the RGB channel (C8EHD FD10 & QHY8L).

I learn this process (in particular LinearFit and CurveTransf) from a tutorial from Gerald Wechselberger.

I realized that LinearFit the RGB components with the Luminance channel is a required to achived proper color LRGB combination.

Using CurvesTranform on Color and Saturation channels is a good way to boost color in the high SNR areas.

I processed the data in PI as follow :

- load the monochrome, linear image from APO & ASI (after background removal, noise removal & deconvolution)

- load the final color nonlinear image from C8EHD & QHY8L

- register the monochrome image onto the color one

- extract RGB channel from color image

- linear fit the R, G & B images using monochrome as reference

- convert back R,G & B channel to RGB image

- extract a & b channels from RGB image

- create RGB image using monochrome as C channel and a & b images as a & b channels

- create non linear image using masked stretch and histo transform

- increase color saturation using Curves Transform on C and S channels

- cancel residual star halo around the bid star on the left (coming from reflections inside the C8EHD), this was done using DBE in PI

- further adjust color and levels in Imac Photo

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Status	Advanced success
Started	...
Astrometry.net job	1679071
PixInsight job	0AU4WBGLLQDMQFLKQVKTY362EG2XMU12
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h41m46s.601
RA (top/left)	16h43m23s.245
RA (top/right)	16h40m12s.870
RA (bottom/right)	16h40m10s.242
RA (bottom/left)	16h43m20s.345

Dec (center)	+36°27′46″.87
Dec (top/left)	+36°40′07″.44
Dec (top/right)	+36°40′52″.29
Dec (bottom/right)	+36°15′20″.40
Dec (bottom/left)	+36°14′37″.79

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Messier 13 L-RGB Combination of two sets of data

Messier 13 L-RGB Combination of two sets of data

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Image Index:

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Messier 13 L-RGB Combination of two sets of data

Messier 13 L-RGB Combination of two sets of data

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