The way to M31

Questions and answers about processing in StarTools and how to accomplish certain tasks.

The way to M31

Postby gaetano » Mon Aug 12, 2019 12:04 pm

Dear all,
the suggestions received on processing IC1805 were precious to me so I dare proposing another subject that is structurally different, in order to understand the subsequent differences in approaching it.
It is the hyper-well-known M31 coming from a noisy stack of few frames, I hope somebody will have little time to show us the way.
You can download it here https://www.dropbox.com/s/5h6x2jatl80l6wi/M31.fts?dl=0

Thank you in advance
Gaetano
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Re: The way to M31

Postby admin » Tue Aug 13, 2019 8:58 am

Hi Gaetano,

You're acquiring nice data! :thumbsup:

Below a (very!) quick process in StarTools 1.5

M31(2).jpg
M31(2).jpg (594.66 KiB) Viewed 84 times


Log as follows;

--- Auto Develop
To see what we got. We can see a red bias, noise, decent calibration except in the corners, oversampling.
--- Bin
To make use of oversampling for noise reduction.
Parameter [Scale] set to [(scale/noise reduction 35.38%)/(798.89%)/(+3.00 bits)]
--- Crop
Cropping away stacking artefacts and misalignment(?) artefacts.
Parameter [X1] set to [189 pixels]
Parameter [Y1] set to [44 pixels]
Parameter [X2] set to [1815 pixels (-319)]
Parameter [Y2] set to [1374 pixels (-52)]
Image size is 1626 x 1330
--- Wipe
Getting rid of light pollution / bias.
Parameter [Dark Anomaly Filter] set to [3 pixels]
--- Auto Develop
RoI over slice of M31
Parameter [Ignore Fine Detail <] set to [4.0 pixels]
Parameter [RoI X1] set to [671 pixels]
Parameter [RoI Y1] set to [525 pixels]
Parameter [RoI X2] set to [882 pixels (-744)]
Parameter [RoI Y2] set to [909 pixels (-421)]
--- HDR
Showing a little more detail in the core.
Tame preset.
--- Deconvolution
Tightens up things just a tiny bit.
Default settings.
--- Color
You're looking for a yellow/milky core (older stars) and bluer outer rim (younger stars).
Parameter [Green Bias Reduce] set to [1.18]
Parameter [Red Bias Reduce] set to [1.58]
Parameter [Cap Green] set to [To Yellow]
--- Wavelet De-Noise
Parameter [Filter Type] set to [Distance Weighted Outlier Rejection]
Parameter [Grain Size] set to [4.0 pixels]
--- Wavelet De-Noise
Parameter [Grain Dispersion] set to [4.0 pixels]
Parameter [Smoothness] set to [69 %]

Hope this helps!
Ivo Jager
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Re: The way to M31

Postby gaetano » Sat Aug 17, 2019 9:04 am

Thank you so much, this helps a whole lot!

By the way, I see you worked this image with version 1.5, is this available for MacOS? If yes, I would be very happy to try it :thumbsup:

Thank you
Gaetano
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Re: The way to M31

Postby admin » Sun Aug 18, 2019 1:46 am

1.5. (including Release Candidates) is indeed available for all platforms. PM sent!
Ivo Jager
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