Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  Andromeda Galaxy  ·  HD3431  ·  HD3969  ·  HD4143  ·  HD4174  ·  HD4322  ·  HD4501  ·  M 110  ·  M 31  ·  M 32  ·  NGC 205  ·  NGC 206  ·  NGC 221  ·  NGC 224  ·  PGC 2162656  ·  PGC 2163200  ·  PGC 2163634  ·  PGC 2164256  ·  PGC 2166758  ·  PGC 2167368  ·  PGC 2168731  ·  PGC 2168810  ·  PGC 2169318  ·  PGC 2172440  ·  PGC 2174300  ·  PGC 2174839  ·  PGC 2175082  ·  PGC 2175091  ·  PGC 2176150  ·  PGC 2176787  ·  And 24 more.
Getting plate-solving status, please wait...
Easy LHaRGB, M31, tjm8874
Powered byPixInsight

Easy LHaRGB, M31

Getting plate-solving status, please wait...
Easy LHaRGB, M31, tjm8874
Powered byPixInsight

Easy LHaRGB, M31

Equipment

Loading...

Acquisition details

Loading...

Description

I tried easy to understand Ha blending method.
(1) Rotate, Crop, (ABE or DBE if necessary)
(2) NoiseXT if necessary
(3) weak stretch (peak around 0.05)
(4) Linear Fit R,G,B,Ha to L.
(5) boosting by Ha, Screen Blend. parameter can be changed as you like
 Boost = 0.6
 L' = ~(~L * ~(Ha*Boost/3))
 R' = ~(~R * ~(Ha*Boost))
 B' = ~(~B * ~(Ha*Boost /10))
(6) LinearFit L', R', B' to G. 
(7) LRGB combination L' R' G B'
(8) process as you like

The equation means 
~(~A*~B)
= 1 - (1 - A)*(1 - B)
= A + B - A*B
This process always keeps result < 1,
0.9 + 0.9 - 0.9*0.9 = 0.99
0.1 + 0.1 - 0.1*0.1 = 0.19

Comments

Sky plot

Sky plot

Histogram

Easy LHaRGB, M31, tjm8874