Rho Ophiuchi cloud complex - Pier 4

Hi Mark, looks great!

I just got data back from Pier 4 but I am having a devil of a time deBayering the files.

I employed the help of a friend in the UK who has far more experience than I do with OSC cameras. We've both come to the conclusion that these are odd files. ZWO says that the Bayer pattern is RGGB but I've tried four patterns with the same results. So far we've tried PIPP, Siril, Fitswork, and APP. No luck. When I zoom in I still see the Bayer grid. APP reports the color space is Grey.

The attached image is the result of using PIPP to deBayer using RGGB. File opened with Siril, and then a screenshot.

May I ask what program you used?

Thanks,
Brian

All right. I found a combination that works.

Sadly PIPP failed.
Siril was the winner but the key was to select GBRG not RGGB as ZWO's website says.

Here is a single 120s frame using "Histogram Stretch" to show the most nebulosity:


Sadly, half of the frames are polluted by satellite and aircraft trails and some clouds.

Brian

Hi Brian, 

I'm fairly certain that it is rggb and the fact that you have a green image is due to the 50 percent contribution from the 2 green pixels in the mosaic. There are various ways of dealing with this and remove the green cast. It will depend on the software you are using as to what you need to do. Other more learned forum members I'm sure will assist in due course. 

Best regards, 
Ray 

Ray,

Years ago was the last time I had an OSC. Now I remember it is the same issue. ZWO says one pattern but to get it to work I need to swap it. Notice how "RGGB" is "GBRG" by swapping the first two characters with the last two. There is the green cast issue that gets sorted out in post-processing. Give me a mono cam any day of the week.

Brian

Hi Ray,

I think that the processing order has everything to do with whether you choose RGGB or GBRG. If it is "top-to-bottom" then you choose one but if it is "bottom-to-top" then you choose the other. I think the take-away is if you are dissatisfied with the pattern quoted by the manufacturer then be sure to try reversing the first two characters with the last two.

Brian

Hi Brian

I use PixInsight (PI) to do the heavy lifting.  Often I throw everything in to BatchPreProcessing and let it deal with everything, making sure to check the CFA image box for a one shot colour camera.  If i debayer myself, the attached image shows the settings I use.  The pattern is definitely RGGB.  Be sure when you stretch to do an un-linked stretch otherwise you will get funny colour results. I don;t know the programmes you have mentioned, but given the same data, they will all give funny results if the right type of stretch is not applied.

To demonstrate - using one of my own datasets (smaller so much quicker to open) of M57 using my ZWO OSC camera, the attached image shows the difference between linked stretch (left) and un-linked stretch (right). Final image also added so you can see the post-processing result.

With us not using the same processing apps, not sure if this helps or not, but stick with it...  I am a long time QSI683wsg-8 user (mono with 8 filters) and I am converting to one shot colour now that these cameras are getting so good!

[attachment]debayer_2020-07-28.JPG[/attachment]

Regards

Mark

A lovely process there Mark, a always

Brian, you keep at it, eventually everything will just fall into place, and everyone here is very friendly and will help.

I myself, I couldn't process a cup of tea let alone the datafiles lol

looks good mark, super clean

May I add this to the bottom of pier 4 equipment page ?

Brian, I will give Pete a nudge for you. he is good with these OSC cameras

Steve - very happy for you to do that..:

Regards
Mark

Steve - very happy for you to do that..:

Regards
Mark

roboscopes.com/index.php/equipment/pier-4

Cheers

Hi Mark, 

Taken aback by your image. It's hard to imagine that what you have done can be achieved using a camera lens (an excellent one) on a reasonably priced camera and imaging for a relatively short time. This, plus a few other images I've seen here, must be a submission to a magazine! What you have achieved would serve as an incentive to anyone wanting to take up astrophotography, either using their own kit, or buying time on a remote site. 

Best regards, 

Ray 

Thanks Ray - very kind.   These OSC cameras seem to get good results in far less time!

Regards

Mark

Just visited this. Lol. Hope you like worms! 

Mark,


This is great and well done to you! It looks like really good, especially without using any calibration files. I hope you are well - keep imaging.


Simon 

Brian,


Thanks for all your contributions to the forum lately. Just so you know, I use Pixinsight all the time and I tend to use the new weighted batch pre-processing programme, although the old BPP is fine, and Pixinsight does all the stacking for me. 99.5% of the time, things turn out fine. I am sure that it is RGGB for the Bayer matrix. I own a ZWO ASI 294 and that is RGGB. I hope this helps and can solve some things for you.


Take care now.

Simon

Brian,


Thanks for all your contributions to the forum lately. Just so you know, I use Pixinsight all the time and I tend to use the new weighted batch pre-processing programme, although the old BPP is fine, and Pixinsight does all the stacking for me. 99.5% of the time, things turn out fine. I am sure that it is RGGB for the Bayer matrix. I own a ZWO ASI 294 and that is RGGB. I hope this helps and can solve some things for you.


Take care now.

Simon

Thanks Simon - much appreciated.  Nice to see you again!

Regards

Mark