Color Module questions

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

Color Module questions

Postby steve72614 » Tue Jan 08, 2019 9:51 pm

Hi Ivo,
I've been exploring different ways of processing some M31 images from my Bortle Class 7 skies with a DSLR, 300mm
f4 lens, and a Astronomix CLS light pollution filter.

pass 1
No DSS RGB Background Calibration, StarTools processing log in BLUE at bottom of post. Color is off, noise is
comparitively low.
https://www.flickr.com/photos/stevestar ... 638767931/

pass 2
DSS RGB Background Calibration, StarTools processing log in RED at bottom of post. Color looks closer to correct,
noise is comparitively high.
https://www.flickr.com/photos/stevestar ... 791013248/

I see in the ST manual that you state that color balancing is nearly impossilbe with a light pollution filter. I'm also
aware that if I do white balancing in DSS, then Star Tools can't rely on the extra helping of green input pixel data to
work with. I assume that is why "pass 2" is noisier.

QUESTIONS)
1. The M31 core was overexposed. The Develop module introduced dark artifacts in the core, which I reduced with the
HDR Tame Highlight feature in pass 1. Other than using a shorter exposure, what is the best way to deal with that?
BTW, I did not see similar artifacts of the M31 core with pass 2.

2. In the Color module, how does using the Reduce Green slider effect the image compared to the Cap Green option?

3. Is Cap Green reversible when adjusting the Color Module controls, or must it be the last thing one does in the Color
module?

4. Pass 1 has less noise, and my family likes it better. I do like the colors of pass 2. Should I even be using the CLS
filter for galaxies with Bortle Class 7 skies?

5. Should I relegate the CLS filter to emission nebula?

BLUE----
-----------------------------------------------------------
StarTools 1.3.5.289
Mon Jan 07 17:21:40 2019
-----------------------------------------------------------
File loaded [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04 m31\Autosave.fts].
---
--- Auto Develop
Parameter [Ignore Fine Detail <] set to [Off]
Parameter [Outside ROI Influence] set to [15 %]
--- Crop
Parameter [X1] set to [600 pixels]
Parameter [Y1] set to [213 pixels]
Parameter [X2] set to [2200 pixels (-394)]
Parameter [Y2] set to [1413 pixels (-309)]
--- Wipe
Parameter [Mode] set to [Correct Color & Brightness]
Parameter [UNKNOWN] set to [Yes]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [4 pixels]
Parameter [Drop Off Point] set to [100 %]
Parameter [Corner Aggressiveness] set to [100 %]
Parameter [Aggressiveness] set to [25 %]
--- Develop
Parameter [White Calibration] set to [Use Stars]
Parameter [Gamma] set to [1.00]
Parameter [Skyglow] set to [0 %]
Parameter [Digital Development] set to [90.85 %]
Parameter [Blue Luminance Contrib.] set to [100 %]
Parameter [Green Luminance Contrib.] set to [100 %]
Parameter [Red Luminance Contrib.] set to [101 %]
Parameter [Dark Anomaly Headroom] set to [5 %]
Parameter [Dark Anomaly Filter] set to [4.0 pixels]
--- Contrast
Parameter [Expose Dark Areas] set to [No]
Parameter [Compensate Gamma] set to [No]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [4 pixels]
Parameter [Aggressiveness] set to [70 %]
Parameter [Dark Anomaly Headroom] set to [15 %]
--- HDR
Parameter [Small Detail Precision] set to [Max]
Parameter [Channels] set to [Brightness Only]
Parameter [Algorithm] set to [Tame Highlights]
Parameter [Dark/Bright Response] set to [2.39]
Parameter [Detail Size Range] set to [20 pixels]
Parameter [Noise Suppression] set to [Off]
Undo.
--- HDR
Parameter [Small Detail Precision] set to [Max]
Parameter [Channels] set to [Brightness & Color]
Parameter [Algorithm] set to [Tame Highlights]
Parameter [Dark/Bright Response] set to [4.65]
Parameter [Detail Size Range] set to [20 pixels]
Parameter [Noise Suppression] set to [Off]
--- Color
Parameter [Cap Green] set to [To Yellow]
Parameter [Bias Slider Mode] set to [Sliders Increase Color Bias]
Parameter [Style] set to [Scientific (Color Constancy)]
Parameter [LRGB Method Emulation] set to [Straight CIELab Luminance Retention]
Parameter [Dark Saturation] set to [1.50]
Parameter [Bright Saturation] set to [Full]
Parameter [Saturation Amount] set to [357 %]
Parameter [Blue Bias Increase] set to [1.00]
Parameter [Green Bias Increase] set to [1.20]
Parameter [Red Bias Increase] set to [3.34]
Parameter [Mask Fuzz] set to [1.0 pixels]
--- Wavelet De-Noise
Parameter [Scale 1] set to [90 %]
Parameter [Scale 2] set to [90 %]
Parameter [Scale 3] set to [90 %]
Parameter [Scale 4] set to [90 %]
Parameter [Scale 5] set to [0 %]
Parameter [Mask Fuzz] set to [1.0 pixels]
Parameter [Scale Correlation] set to [3]
Parameter [Color Detail Loss] set to [12 %]
Parameter [Brightness Detail Loss] set to [12 %]
Parameter [Grain Size] set to [3.6 pixels]
Parameter [Read Noise Compensation] set to [Off]
Parameter [Smoothness] set to [75 %]
File saved [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04 m31\m31_star_tools_out_v2.tiff].
File saved [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04 m31\m31_star_tools_out_v2.jpg].

RED--
-----------------------------------------------------------
StarTools 1.3.5.289
Tue Jan 08 10:43:20 2019
-----------------------------------------------------------
File loaded [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04 m31\Autosave001.fts].
---
--- Auto Develop
Parameter [Ignore Fine Detail <] set to [Off]
Parameter [Outside ROI Influence] set to [15 %]
--- Crop
Parameter [X1] set to [404 pixels]
Parameter [Y1] set to [38 pixels]
Parameter [X2] set to [2404 pixels (-190)]
Parameter [Y2] set to [1538 pixels (-184)]
--- Wipe
Parameter [Mode] set to [Correct Color & Brightness]
Parameter [UNKNOWN] set to [Yes]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [8 pixels]
Parameter [Drop Off Point] set to [100 %]
Parameter [Corner Aggressiveness] set to [100 %]
Parameter [Aggressiveness] set to [70 %]
--- Develop
Parameter [White Calibration] set to [Use Stars]
Parameter [Gamma] set to [1.00]
Parameter [Skyglow] set to [0 %]
Parameter [Digital Development] set to [92.70 %]
Parameter [Blue Luminance Contrib.] set to [100 %]
Parameter [Green Luminance Contrib.] set to [100 %]
Parameter [Red Luminance Contrib.] set to [100 %]
Parameter [Dark Anomaly Headroom] set to [5 %]
Parameter [Dark Anomaly Filter] set to [4.0 pixels]
--- Contrast
Parameter [Expose Dark Areas] set to [No]
Parameter [Compensate Gamma] set to [No]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [4 pixels]
Parameter [Aggressiveness] set to [75 %]
Parameter [Dark Anomaly Headroom] set to [15 %]
Undo.
Redo.
--- Color
Parameter [Cap Green] set to [To Yellow]
Parameter [Bias Slider Mode] set to [Sliders Reduce Color Bias]
Parameter [Style] set to [Scientific (Color Constancy)]
Parameter [LRGB Method Emulation] set to [Straight CIELab Luminance Retention]
Parameter [Dark Saturation] set to [2.00]
Parameter [Bright Saturation] set to [Full]
Parameter [Saturation Amount] set to [200 %]
Parameter [Blue Bias Reduce] set to [1.03]
Parameter [Green Bias Reduce] set to [1.00]
Parameter [Red Bias Reduce] set to [1.69]
Parameter [Mask Fuzz] set to [1.0 pixels]
--- Wavelet De-Noise
Parameter [Scale 1] set to [90 %]
Parameter [Scale 2] set to [90 %]
Parameter [Scale 3] set to [90 %]
Parameter [Scale 4] set to [90 %]
Parameter [Scale 5] set to [0 %]
Parameter [Mask Fuzz] set to [1.0 pixels]
Parameter [Scale Correlation] set to [3]
Parameter [Color Detail Loss] set to [15 %]
Parameter [Brightness Detail Loss] set to [15 %]
Parameter [Grain Size] set to [6.4 pixels]
Parameter [Read Noise Compensation] set to [Off]
Parameter [Smoothness] set to [75 %]
--- Contrast
Parameter [Expose Dark Areas] set to [No]
Parameter [Compensate Gamma] set to [No]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [4 pixels]
Parameter [Aggressiveness] set to [57 %]
Parameter [Dark Anomaly Headroom] set to [15 %]
File saved [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04
m31\m31_star_tools_out_from_autosave1_dss_back_cal_medium.jpg].
File saved [D:\users\steve\my_docs\astronomy\our astrophotographs\2019-01-04
m31\m31_star_tools_out_from_autosave1_dss_back_cal_medium.tiff].

Thanks for reading this book!

Steve[color=#000000][color=#000000][/color][/color]
steve72614
 
Posts: 11
Joined: Mon Apr 17, 2017 10:22 pm

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