NGC 6995/6992 in HOO with starcolor thist ime

[Mike in Rancho]

Hi Freddy, thanks for posting!

The files made me quickly realized that I did not read your initial post closely enough. So, your RGB stack is NOT also L-eNhance, but full broadband! Oops. Well that changes things.

For one, the colors are to be expected -- except perhaps the neon-ization from the combo of ST and Gimp. But, with broadband you are going to probably get more of a salmon in the Ha, and for sure teal in the OIII. Because that's what they are.

Plus, you have created a disconnect between luminance and chrominance, something Ivo has discussed many times. Usually in the context of HaRGB I believe, but the concept would still hold. This could warp the colors more, I think.

So indeed I just composed as L, RGB (2xG from OSC), and NOT as bicolor, because that would be wrong for broadband. I left the weighting at defaults although those could be altered if need be.

You do have some vignetting (I think) that is not being properly corrected by your flats, so I used the vignetting preset in Wipe as a starting point and upped DAF and aggressiveness from there.

SVD worked pretty well, I thought.

Colors were sampled normally as per broadband OSC. The green strength of the Veil is to be expected. Removing too much green bias will lead to a magenta/purple situation, so you don't want to do that. From the starting point of the sampling, I just did one mouse wheel turn higher in the green bias reduction slider, checking Max RGB as I did so. In order to then end up more where I think you wanted, instead of further green bias reduction, at that point I just moved green cap to 100%. A few pixels of highlight repair to clean up some stars, and then put my saturations where I wanted.

Shrinkage was used, as was some SS in dimsmall (not isolate as even with adjustments there was too much detail sharpness lost) followed by an SS saturate.

Considering the luminance-chrominance disconnect and that the RGB was full broadband, I think I am okay with the result, that does start to look a bit more like a traditional HOO Veil, but some very nice RGB stars. There are more ways to go about this of course, especially if you were to collect some L-eNhance with the color Canon. At that point you could do any number of different layer blends, extractions and compositions, or NB Accent.

Don't know if any of that helps at all? I avoid Gimp manipulation and only use it for scaling and jpg compression export, which it is very good at.

Freddy East Veil L-eNh mono + OSC ST8 1B.jpg (521.25 KiB) Viewed 1518 times

Code: Select all

Loading luminance channel data
File loaded in LRGB module [G:\ASTRO\2-ST FOLDER\freddy\east veil\masterLight_BIN-1_5202x3464_EXPOSURE-360.00_L_enhance_Mono_r.fit].
Loading red channel data
File loaded in LRGB module [G:\ASTRO\2-ST FOLDER\freddy\east veil\masterLight_BIN-1_6024x4020_EXPOSURE-180.20s_FILTER-NoFilter_RGB.fit].
Loading green channel data
File loaded in LRGB module [G:\ASTRO\2-ST FOLDER\freddy\east veil\masterLight_BIN-1_6024x4020_EXPOSURE-180.20s_FILTER-NoFilter_RGB.fit].
Loading blue channel data
File loaded in LRGB module [G:\ASTRO\2-ST FOLDER\freddy\east veil\masterLight_BIN-1_6024x4020_EXPOSURE-180.20s_FILTER-NoFilter_RGB.fit].
--- Compose
Parameter [Luminance, Color] set to [L + Synthetic L From R(2xG)B, RGB (Color from OSC/DSLR)]
Parameter [Color Ch. Interpolation] set to [On]
Parameter [NB Accents Type] set to [Ha/S-II from NB filter]
Parameter [Lum Total Exposure] set to [1h00m (60m) (3600s)]
Parameter [Blue Total Exposure] set to [1h00m (60m) (3600s)]
Parameter [Green Total Exposure] set to [1h00m (60m) (3600s)]
Parameter [Red Total Exposure] set to [1h00m (60m) (3600s)]
Image size is 6024 x 4020
Type of Data: Linear, was not Bayered, or was Bayered + white balanced
--- Auto Develop
Parameter [Ignore Fine Detail <] set to [Off]
Parameter [Outside RoI Influence] set to [15 %]
Parameter [RoI X1] set to [0 pixels]
Parameter [RoI Y1] set to [0 pixels]
Parameter [RoI X2] set to [6024 pixels (-0)]
Parameter [RoI Y2] set to [4020 pixels (-0)]
Parameter [Detector Gamma] set to [1.00]
Parameter [Shadow Linearity] set to [50 %]
--- Crop
Parameter [X1] set to [120 pixels]
Parameter [Y1] set to [40 pixels]
Parameter [X2] set to [5964 pixels (-60)]
Parameter [Y2] set to [3780 pixels (-240)]
Image size is 5844 x 3740
--- Bin
Parameter [Scale] set to [scale 35.38% / +3.00 bits / +1.83x SNR improvement]
Image size is 2067 x 1323
--- Wipe
Parameter [Synthetic Dark/Bias] set to [Off]
Parameter [Gradient Edge Behavior] set to [Absorb 50%]
Parameter [Synthetic Flats] set to [Vignetting]
Parameter [Sampling Precision] set to [256 x 256 pixels]
Parameter [Dark Anomaly Filter] set to [5 pixels]
Parameter [Gradient Falloff] set to [75 %]
Parameter [Synth. Bias Edge Area] set to [100 %]
Parameter [Gradient Aggressiveness] set to [97 %]
Parameter [Correlation Filtering] set to [Off]
Redoing stretch of linear data
--- Auto Develop
Parameter [Ignore Fine Detail <] set to [1.4 pixels]
Parameter [Outside RoI Influence] set to [15 %]
Parameter [RoI X1] set to [505 pixels]
Parameter [RoI Y1] set to [375 pixels]
Parameter [RoI X2] set to [769 pixels (-1298)]
Parameter [RoI Y2] set to [737 pixels (-586)]
Parameter [Detector Gamma] set to [1.00]
Parameter [Shadow Linearity] set to [50 %]
--- Contrast
Parameter [Expose Dark Areas] set to [Yes]
Parameter [Brightness Retention] set to [Off]
Parameter [Precision] set to [256 x 256 pixels]
Parameter [Shadow Detail Size] set to [10 pixels]
Parameter [Locality] set to [50 %]
Parameter [Shadow Dyn Range Alloc] set to [50 %]
--- HDR
Parameter [Signal Flow] set to [Tracked]
Parameter [Quality] set to [Low]
Parameter [Gamma Shadow (Lift)] set to [1.00]
Parameter [Gamma Highlight (Tame)] set to [1.25]
Parameter [Gamma Smoothen] set to [20.0 pixels]
Parameter [Context Size] set to [25x25 pixels (1.21% image W, 1.89% image H)]
Parameter [Shadows Detail Boost] set to [50 %]
Parameter [Highlights Detail Boost] set to [30 %]
Mask used (BASE64 PNG encoded)
PSF samples used (8 PSF sample locations, BASE64 encoded)
VFMAAAgAEwgrBbMCmwSKBkYETgIdAzEHfAKNA8IBqgZKAd0GjABOBVoA
--- Spatially Variant PSF Deconvolution
Parameter [PSF Resampling] set to [Intra-Iteration + Centroid Tracking Linear]
Parameter [Synthetic PSF Model] set to [Circle of Confusion (Optics Only)]
Parameter [Sampled PSF Area] set to [15x15]
Parameter [Synthetic PSF Radius] set to [1.5 pixels]
Parameter [Synthetic Iterations] set to [Off]
Parameter [Spatial Error] set to [1.00]
Parameter [Deringing Fuzz] set to [20.0 pixels]
Parameter [Deringing Detect] set to [80 %]
Parameter [Dyn. Range Extension] set to [1.00]
Parameter [Linearity Cutoff] set to [85 %]
Parameter [Sampled Iterations] set to [10x]
Parameter [Deringing Amount] set to [0.91]
Mask used (BASE64 PNG encoded)
--- Color
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 [Matrix] set to [Identity (OFF)]
Parameter [Dark Saturation] set to [3.5]
Parameter [Bright Saturation] set to [6.5]
Parameter [Saturation Amount] set to [333 %]
Parameter [Blue Bias Reduce] set to [1.02]
Parameter [Green Bias Reduce] set to [1.52]
Parameter [Red Bias Reduce] set to [1.00]
Parameter [Mask Fuzz] set to [1.0 pixels]
Parameter [Cap Green] set to [100 %]
Parameter [Highlight Repair] set to [4 pixels]
Mask used (BASE64 PNG encoded)
--- Shrink
Parameter [Mode] set to [Tighten]
Parameter [Halo Extend] set to [1 pixels]
Parameter [Iterations] set to [15]
Parameter [Regularization] set to [0.85]
Parameter [Color Taming] set to [2 pixels]
Parameter [De-ringing] set to [1.1 pixels]
Parameter [Un-glow Strength] set to [Off]
Parameter [Un-glow Kernel] set to [Off]
--- Super Structure
Parameter [Detail Preservation] set to [Linear Brightness Mask Darken]
Parameter [Compositing Algorithm] set to [Multiply, Gamma Correct]
Parameter [Brightness, Color] set to [Process Both]
Parameter [Brightness Retention] set to [Local Median]
Parameter [Mask Fuzz] set to [1.0 pixels]
Parameter [Airy Disk Radius] set to [50 %]
Parameter [Gamma] set to [0.75]
Parameter [Detail Preservation Radius] set to [20.0 pixels]
Parameter [Saturation] set to [50 %]
Parameter [Strength] set to [100 %]
--- Super Structure
Parameter [Detail Preservation] set to [Linear Brightness Mask]
Parameter [Compositing Algorithm] set to [Screen]
Parameter [Brightness, Color] set to [Only Color]
Parameter [Brightness Retention] set to [Off]
Parameter [Mask Fuzz] set to [1.0 pixels]
Parameter [Airy Disk Radius] set to [50 %]
Parameter [Gamma] set to [0.25]
Parameter [Detail Preservation Radius] set to [20.0 pixels]
Parameter [Saturation] set to [200 %]
Parameter [Strength] set to [100 %]
--- Unified De-Noise
Parameter [Grain Size] set to [6.0 pixels]
Parameter [Walking Noise Size] set to [1.0 pixels]
Parameter [Walking Noise Angle] set to [0]
--- Unified De-Noise
Parameter [Scale 1] set to [99 %]
Parameter [Scale 2] set to [95 %]
Parameter [Scale 3] set to [95 %]
Parameter [Scale 4] set to [95 %]
Parameter [Scale 5] set to [50 %]
Parameter [Equalized Grain] set to [0 %]
Parameter [Scale Correlation] set to [25 %]
Parameter [Color Detail Loss] set to [50 %]
Parameter [Brightness Detail Loss] set to [50 %]
Parameter [Grain Dispersion] set to [6.0 pixels]
File saved [G:\ASTRO\2-ST FOLDER\freddy\east veil\Freddy East Veil L-eNh mono + OSC ST8 1A.tiff].
--- Photographic Film Development Emulation
Parameter [White Calibration] set to [Use Stars]
Parameter [Gamma] set to [0.95]
Parameter [Skyglow] set to [0 %]
Parameter [Digital Development] set to [Off]
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 [6.0 pixels]
File saved [G:\ASTRO\2-ST FOLDER\freddy\east veil\Freddy East Veil L-eNh mono + OSC ST8 1B.tiff].

I still kept a fairly busy starfield and perhaps a wider FOV than your original, and I do see some nice filiment detail in yours as well as more stretched than I did. But perhaps it could help with the colors at least.

[fmeireso]

Thanks Mike,

I sure do like the colors more. Little time now but i surely want to redo following yur footsteps. The red seems nice enough....

It is the colors that troubled me the most, as for the detail i am quite please with what i could catch. This mono DSLR is perhaps a bit of an uncommen approach but imho , it sure works and is fairly unexpensive

Yes this OSC is broadband, indeed sometimes i try this with L-enhance too. Sofar i still did no figure out what is actually the best approach.
A Luminance stack and a broadband OSC stack is exactly what 'The Elf' does. But sometimes i try an L-enhance OSC stack too.

CS
Freddy

[Mike in Rancho]

Totally makes sense, Freddy! Experiment away.

Just a matter of trying to remember all those things Ivo told us about what the luminance can do to the colors.

For certain targets, an L-eNhance on both your mono and OSC cams can totally work out, though sometimes the right "blending" is necessary. Depending on how things look, in such situations I've used either straight L or L + Synth L. Sometimes there's a little mismatch between the higher resolution mono and what you get in the colors after bayer interpolation. But, you can load up on the better mono and take less of the OSC to just be used for coloring (possibly with a bit of extra denoise on the color, but that all depends).

At least with two matching Canons, you should have little in the way of scaling issues. When I was doing the above, it was with a 2600MM and D5300f/s, and while both are APS-C, they aren't identical matches.