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Calling all Startools users, what is going on here?

parallaxerr

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parallaxerr

parallaxerr

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Hi all,

I'm new to imaging and thus new to Startools. I am slowly starting to learn it's functions and understand how it all works...or at least I thought so!

I took this image a few nights ago and ran it through ST at 2am so did a very quick job. The image consists of 119 x30s subs, 50 dark, 50 flat, 50 dark flat. As I recall, I ran Autodev, wipe, autodev, crop, bin 50%, colour, tracking off (final de-noise).

Autosave.jpeg

I was pleased with the result but thought I'd come back to work on it again tonight, using the same FITS file out of DSS. However, every time I autodev I get this letterbox effect...

Untitled1.jpg

After wiping and re-streching in autodev again I get this...

Untitled2.jpg

Can anyone suggest what may be causing this, it didn't happen the first time I ran the FITS file through ST and I'm pretty sure I'm not doing anything different (leaving all settings as standard at the moment). Is this is a known/common issue caused by a missed step?

Thanks in advance,

Jon

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The Admiral

The Admiral

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Very strange. I don't think I have an answer Jon, but a couple of points. You can find out exactly what you did last time by looking at the ST log file which is in the folder where the ST program is. It's not desperately user friendly, but you will be able to see the date, and it'll list every step.

Secondly, your original sequence of operations, if correct, puts the crop after two stages of development and the wipe. You should always crop out the stacking errors before the wipe and the re-stretch. If you want to crop again after that then so be it.

Ian

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alacant

alacant

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Hi. Almost certainly stacking artefacts. AutoDev. Then at 100%, look in corners and around the edges. Crop away from the edges to lose the artefacts. Then it's Wipe and Develop. Choose Redo Global Stretch and then home in gradually until the image emerges. HTH.

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ChrisLX200

ChrisLX200

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I would agree it's likely to be stacking artifacts which have not been cropped off, but it seems very severe - but that may be because I'm not used to using autodevelop much.

Personally, I don't use Autodevelop for anything other than an initial look-see at what is in the data. My normal routine is Autodevelop, Crop (if required), Develop (from scratch), Wipe (if required), Develop (again from scratch). That gives the basic stretch and I continue from there.

ChrisH

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parallaxerr

parallaxerr

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Thanks everyone for the pointers. I didn't know about the log Ian, that's a brialliant function and pointed to the fact that first time around I did indeed crop before the second autodev!

Repeating the logged workflow got rid of the strange effect seen above. It does seem it was a result of stacking artefacts, however, it is not the artefacts themselves that are exposed as they are only around the outer 10% or so of the image - mostly field rotation due to imaging with an alt-az mount.

 

 

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parallaxerr

parallaxerr

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16 hours ago, alacant said:

If you like, post the fits somewhere and we can have a look. HTH.

Hi Alcant, thanks. Whilst I seem to have sorted the original problem, I would be really interested to see what others can do with my data.

If anyone's interested or inclined to have a go at putting it through ST, here's the FITS file...

https://1drv.ms/u/s!AhWKj4BCIWqOgQwJMnt5wiLPce18

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parallaxerr

parallaxerr

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35 minutes ago, bottletopburly said:

Had a play in startools looks fine too me well done :thumbright:

M42 SGL .JPG

HI Bottletopburly,

Thanks for taking the time to have a go with my data, its really interesting to see how someone else processes it.

I'll check out the log file for details :thumbsup:

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parallaxerr

parallaxerr

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On 20/11/2016 at 01:34, wimvb said:

Not Startools, but I had a go with your data anyway.

Here's what PixInsight will do to it.

parallaxerr_m42.jpg

Cheers,

Thanks, very interesting to see it processed in Pixinsight. I got a trial licence for PI but have yet to try it, ST is taking enough learning!

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Nigel G

Nigel G

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Just now, Stub Mandrel said:

Does anyone know why Startools creates these artefacts even if you use the DSS option to crop the image to the area that's in all the subs?

The only reason for artefacts I know is slight different centre of frame, with Alt AZ theres always a fair crop to do. Just 1 pixel will do it.

Nige.

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parallaxerr

parallaxerr

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2 minutes ago, Stub Mandrel said:

Does anyone know why Startools creates these artefacts even if you use the DSS option to crop the image to the area that's in all the subs?

Not sure but I've tried standard, mosaic and intersection. Mosaic and intersection caused big problems in ST even after cropping.

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Nigel G

Nigel G

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Here's a try with ST using Auto dev, crop, bin, wipe, auto dev, decon, colour, HDR, Stop tracking and isolate in life.

I find using manual develop on the second stretch starts to burn the core, with auto dev and slice through the main region of interest will save the core from over exposure.

Nige.

Autosave1.jpg

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Nigel G

Nigel G

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Jon. I have posted a link to one of my video's showing the Auto dev, crop, wipe and second auto dev with the slice, you will need to try different slice sizes, see video you'll understand :icon_biggrin:

Ok here goes

Open with Bayered and is not white balanced.

--- Auto Develop
Parameter [Ignore Fine Detail <] set to [Off]
Parameter [Outside ROI Influence] set to [15 %]
--- Crop
Parameter [X1] set to [178 pixels]
Parameter [Y1] set to [115 pixels]
Parameter [X2] set to [1979 pixels (-155)]
Parameter [Y2] set to [1337 pixels (-82)]

--- Bin TO........ IMPROVE S/N RATIO
Parameter [Scale] set to [(scale/noise reduction 35.38%)/(798.89%)/(+3.00 bits)]
--- 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 [95 %]
--- Auto Develop.......... HERE YOU SELECT A SLICE THROUGH M42 & M43 WITH THE CURSOR TAKING A LITTLE OF THE DARK BACKGROUND WITH IT (SEE VIDEO AT BOTTOM FOR AN EXAMPLE)
Parameter [Ignore Fine Detail <] set to [10.4 pixels]
Parameter [Outside ROI Influence] set to [15 %]
--- Deconvolution............. USE AUTO MASK WHEN DECON ASK'S
Parameter [Image Type] set to [Deep Space]
Parameter [Mask Behavior] set to [De-ring Mask Gaps, Hide Result]
Parameter [Radius] set to [2.0 pixels]
Parameter [Iterations] set to [6]
Parameter [Regularization] set to [1.00 (optimal noise and detail)]
Parameter [Mask Fuzz] set to [14.6 pixels]
--- Color.......FILL MASK
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 [4.70]
Parameter [Bright Saturation] set to [Full]
Parameter [Saturation Amount] set to [121 %]
Parameter [Blue Bias Reduce] set to [1.15]
Parameter [Green Bias Reduce] set to [1.09]
Parameter [Red Bias Reduce] set to [1.31]
Parameter [Mask Fuzz] set to [1.0 pixels]
--- HDR
Parameter [Small Detail Precision] set to [Max]
Parameter [Channels] set to [Brightness Only]
Parameter [Algorithm] set to [Reveal All]
Parameter [Dark/Bright Response] set to [Full]
Parameter [Detail Size Range] set to [369 pixels]
Parameter [Strength] set to [1.1]
--- HDR
Parameter [Small Detail Precision] set to [Max]
Parameter [Channels] set to [Brightness Only]
Parameter [Algorithm] set to [Optimize Soft]
Parameter [Dark/Bright Response] set to [Full]
Parameter [Detail Size Range] set to [21 pixels]
Parameter [Strength] set to [1.1]
--- Life ....THIS FIRST LIFE IS ISOLATE WITH NOTHING CHANGED.
Parameter [Detail Preservation] set to [Linear Brightness Mask]
Parameter [Compositing Algorithm] set to [Multiply, Gamma Correct]
Parameter [Inherit Brightness, Color] set to [Off]
Parameter [Output Glow Only] set to [No]
Parameter [Airy Disk Sampling] set to [128 x 128 pixels]
Parameter [Airy Disk Radius] set to [8 pixels]
Parameter [Glow Threshold] set to [0 %]
Parameter [Detail Preservation Radius] set to [20.0 pixels]
Parameter [Saturation] set to [100 %]
Parameter [Strength] set to [100 %]
Parameter [Mask Fuzz] set to [1.0 pixels]
--- Life
Parameter [Detail Preservation] set to [Min Distance to 1/2 Unity]
Parameter [Compositing Algorithm] set to [Power of Inverse]
Parameter [Inherit Brightness, Color] set to [Off]
Parameter [Output Glow Only] set to [No]
Parameter [Airy Disk Sampling] set to [128 x 128 pixels]
Parameter [Airy Disk Radius] set to [8 pixels]
Parameter [Glow Threshold] set to [12 %]
Parameter [Detail Preservation Radius] set to [20.0 pixels]
Parameter [Saturation] set to [50 %]
Parameter [Strength] set to [36 %]
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 [6]
Parameter set to [12 %]
Parameter [Brightness Detail Loss] set to [12 %]
Parameter [Grain Size] set to [16.0 pixels]
Parameter [Read Noise Compensation] set to [Off]
Parameter [Smoothness] set to [75 %]

I then re cropped to remove slight gradient at bottom of image.

Good luck.

Nige.

 

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parallaxerr

parallaxerr

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Great info Nige, thanks for taking the time to post it up. I was previously slicing in autodev but a few users suggested homing in, in the dev module. Looks like it can be done either way.

I downloaded v1.4 yesterday so will have a look to see the differences.

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