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Messages - dpaul

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46
I've been using TVG denoise to remove the graininess of the background sky. Lets assume for example I have an integrated set of light frames but its still linear and to protect a galaxy structure's sharpness.

So I create a clone and stretch the clone/do background noise removal to get a dark sky background, then invert to create a mask. I then use this mask to protect galaxy structures from being softened by the denoise process.

I'm using only mild settings - strength, edge protection, smoothness all at 2.0.  The background gets smoothed out nicely but I then notice faint contour lines around the galaxy.

How can I avoid this. am I doing something wrong?  Also is there another way of getting what I want with a different process?

Thanks

David


47
Can someone help with this general question-

I am ok with calibrating light frames using Superbias and a Master dark (without extracting bias) then using both in ''Image Calibration''. Sometimes however it warns me that the optimisation threshhold may be too high when using the default of 3. This seems to occur with luminance frames which have more saturated sky background - moving the threshold down to 2.0 gets rid of the warning message.

So here's my question - the higher the threshold, the darker the background of the calibrated frames becomes. At 10 fer example the result seems much better. So I'd like to know why this is not good practice?

Thanks

David




48
General / Re: Color Calobration - Incorrect Color Outcome
« on: 2018 February 24 16:41:02 »
Thanks Geoff,

I'll try to avoid mixing up the frames in the first instance !

David


49
General / Re: Color Calobration - Incorrect Color Outcome
« on: 2018 February 23 19:07:34 »
Hello Rick

I re-imaged NGC 3718 last night and did a quick Pixinsight post processing today and the colors are now ok-
So I must have mixed up some frames the previous time. Last nights result were not ideal due to incorrect tracking on my equatorial platform (didn't align as well I should have done) but will try again another night - one of my favourite objects!

Thanks

David

50
General / Re: 2x2 binning - one shot color
« on: 2018 February 22 01:23:32 »
Ok Rick,

I'll accept defeat on this one!

Appreciate all the responses.

David

51
General / Re: Cannot Debayer images
« on: 2018 February 21 13:46:57 »
Hi Vince,

A different problem but due I think because 2x2 binning. I'm going to try 1x1 so then should be ok (hopefully!)

David

52
General / Re: Any new advice for monitor choice?
« on: 2018 February 21 13:45:48 »
Hi

If this helps, I have a Dell 16'' 4K laptop and it ''definately'' makes a world of difference in the sharpness and color vibrancy.

Regards

David

53
General / Re: 2x2 binning - one shot color
« on: 2018 February 21 13:44:05 »
Hi Rob,

I believe 2x2 binning with a CMOS puts data from 4 pixels into a single pixel but in 'software' not on the chip like CCD.
When viewing live with my camera, it debayers on the fly and shows color images, so using 2x2 binning I can get more detail with short exposures than with 1x1. However when capturing data for processing, I save FITS files non-debayered so this must of course be affecting the CFA array so its no surprise I get screwed up color when using debayering process in PI.

So my question is ''could Pixinsight be programmed to debayer a captured 2x2 frame - surely that's possible?

Thanks

David

 

54
General / Re: Cannot Debayer images
« on: 2018 February 21 04:15:24 »
Hi Vince

Are you doing 1x1 binning or something else?

I've just posted my own question on this topic/debayering.

Thanks

David

55
General / 2x2 binning - one shot color
« on: 2018 February 21 04:07:26 »
I have a fundamental question about imaging processing with a one-shot color CMOS camera. When saving RAW fits files using 2x2 binning, I'm then having problems debayering the results to get any strong color/right color. I'm wondering if this is because of the binning. I haven't tried 1x1 yet but will do so when its next clear one night.

So fundamentally, can Pixinsight support processing of 2x2 binned frames?  This is software binning with CMOS so can the debayering process handle this somehow? It must be screwing up the CFA data and explains why it can't autdetect CFA, I have to do it manually.

I have an unguided scope so it would be really beneficial if I can use 2x2 binning with OSC. Also for my scope its already very over-sampled with 2x2. I always use 2x2 with mono cameras and of course that's not an issue.

If this isn't currently possible with Pixinsight, it would be a great addition if that can be done.

Thanks

David




56
General / Re: Additive Stacking?
« on: 2018 February 21 03:58:41 »
Hi Cho

I agree!

David

57
General / Re: Additive Stacking?
« on: 2018 February 21 01:56:35 »
Chris,
Thanks for that info - I actually take a walk around the garden for some exercise, works well!


Rick
Thanks for the note, that's a real eye opener. I reviewed two saved images, one was 30 seconds, the other 3x30seconds additive. You are right after stretching the detail looks similar but without stretching the 30 second ''appears'' to possess much less detail.

David

58
General / Re: Additive Stacking?
« on: 2018 February 20 18:03:27 »
Hi Rob,

Yes I meant can it add incoming files - but not live,  just for post processing. So if I have a load of frames in a folder, it would be great if these could be fed into pixinsight and added (no averaging).

David

59
General / Re: Color-Splitter type CMOS Chip vs RGB type
« on: 2018 February 20 17:56:16 »
Thanks Rob
Don't know much about those two terms - would be good to get some additional comments on whether 'in general' such sensors are used for imaging (even if not using PI)

Thanks

David

60
General / Re: Additive Stacking?
« on: 2018 February 20 17:51:16 »
Hi Rob,

What I mean is effectively turning a single 20 second frame into a 60 second frame if 5 additive stacks of 20 second are done. This definitely works with live video astronomy where you can see the image build infront of your eyes as live stacking occurs.

David

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