9 replies to this topic

[Achernar]

I have an issue that is quite frankly got me perplexed. I acquired a ZWO 1600MC camera which seems to be in perfect working order. However, when I try to de-Bayer or de-mosaic the subs in Nebulosity, all I get is either a monochrome image OR images with a weird color cast predominantly of one color. When I look at them through a FITS viewer they show up as RGB color images. I suspect the problem is not the camera, but something I am doing or not doing in processing, OR the processing software is not able to handle the subs for some reason because I used an ASI Air to acquire the data. I don't have any problems with my subs from the ZWO 533MM camera, but this is a head scratcher why even the stacked image from live stacking show below turns out better than when I try to use the separate frames. This is an uncalibrated live stack image......

 

Taras

Attached Thumbnails

• 

Edited by Achernar, 13 November 2024 - 09:00 PM.

[Achernar]

This is what happens when I try to calibrate, align and stack the separate frames in Nebulosity.... I know I am missing something, and I have been trying various settings in the "de-mosaicing" tab of Nebulosity, but nothing yields anything like a normal looking image. I am thinking of trying other processing suites to see if that will solve the problem, or maybe I should just bite the bullet, buy, and learn to use PixInsight.

 

Taras

Attached Thumbnails

• 

Edited by Achernar, 13 November 2024 - 09:08 PM.

[Achernar]

Yet with the ZWO ASI Studio Deep Sky Stack, I managed to get this image from the very same data.

 

Taras

Attached Thumbnails

• 

[Tapio]

If you get correct stack with ASI Studio then must be something with Nebulosity (debayering).

I used Nebulosity some 10 years ago. Checked and it was last updated in 2020.

Maybe it's time to move to something newer?

Apart from PI there are other alternatives: Siril, APP, AstroArt to name a few.

[sharkmelley]

Have you tried to explicitly specify alternative Bayer matrix patterns?

[Achernar]

Have you tried to explicitly specify alternative Bayer matrix patterns?

Yes, all with terrible results.....

[Achernar]

If you get correct stack with ASI Studio then must be something with Nebulosity (debayering).

I used Nebulosity some 10 years ago. Checked and it was last updated in 2020.

Maybe it's time to move to something newer?

Apart from PI there are other alternatives: Siril, APP, AstroArt to name a few.

I'm only using it because I was starting out at the time, and it seems to work fine with the subs I get with the ZWO 533MM camera I usually use. But I am starting to work on learning how to use SIRIL because it does do certain tasks better than Nebulosity, such as denoising and removal of color casts.

 

Taras

[Tapio]

Strange.

Could you share the problematic file?
I could have a go. I should have Nebulosity somewhere.

[Achernar]

Strange.

Could you share the problematic file?
I could have a go. I should have Nebulosity somewhere.

I'd have to e-mail them to you....if you figure this out it would help others out with the same issue.

 

Taras 

[sharkmelley]

Generally speaking you need to debayer with the correct Bayer pattern and then perform white balancing.  Both steps are required before the image looks "normal".