Method to create galaxy mask

[jshortt]

Hi all, I'm working on processing some data that I have for M77 and I'm following methods from Inside PixInsight. A galaxy mask is need for curves and other stepon the nonlinear RGB. I got a good galaxy mask by taking the layer 8 output from the ExtractWaveletLayers script on my L_mask and then factoring it by the inverse of my star_mask.

Any comments on this method? It seems pretty simple and the result mask looks pretty good to me. I haven't gotten far enough along in the processing to use this mask yet.

John

[RickS]

Sounds like a reasonable approach, John.  If the mask looks good it probably is 

[jshortt]

Thanks. I'll update on how it works out

John

[mmirot]

Another method  Range Mask for the galaxy - StarMask= Galaxy alone.   I use multiscale tools as you suggest too.

[jshortt]

I found that the mask worked well except for the stars in front of the galaxy and this was because the star mask needed to be improved. Once I did that it worked well for Curves, HDRMT, LHE and MLT to bring out colour and details in the galaxy. Unfortunately I only have 30 minutes per R/G/B and so I am pushing it with this data

John