Debayer pattern for Touptek2600C ( IMX571 )

Have you checked the neutralize background option? All OSC will make a  green tint if this is not enabled. There are more green pixels than blue or red.

Thanks Stefan, I know about a bit of postprocessing but was asking for the correct bayer pattern to use.

By the way, that option takes the green cast away but could also be done in PixInsight for example.

Right now I'm experimenting with different masks and for the moment RBGGG.... etc seems to

give the correct/normal greyish looking output. ( Efectively turns out Gray-scale image )

When I apply a masterflat I made yesterday things turn up terribly green so that's likely the

culprit but when stacking without masterflat using RGGB as debayer mask, things come out terribly

green again!

Of course I was imaging from my lightpoluted balcony so that's also an important factor.

Maybe will do some testing with an L-Extreme filter to get rid of the light polution.

That's why I'm asking, I'm confused at the moment.

Regards,

Mert

Posted by: @digitaliz-se

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Have you checked the neutralize background option? All OSC will make a  green tint if this is not enabled. There are more green pixels than blue or red.

Thank you very much Stefan @digitaliz-se for assisting here. The main reason for the data to look green is not that there are 2x green pixels over red and blue ones, but rather that the sensor, as most sensors, is more sensitive in the green wavelengths when compared to red and blue wavelengths 😉

Posted by: @lammertus

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Thanks Stefan, I know about a bit of postprocessing but was asking for the correct bayer pattern to use.

By the way, that option takes the green cast away but could also be done in PixInsight for example.

Right now I'm experimenting with different masks and for the moment RBGGG.... etc seems to

give the correct/normal greyish looking output. ( Efectively turns out Gray-scale image )

When I apply a masterflat I made yesterday things turn up terribly green so that's likely the

culprit but when stacking without masterflat using RGGB as debayer mask, things come out terribly

green again!

Of course I was imaging from my lightpoluted balcony so that's also an important factor.

Maybe will do some testing with an L-Extreme filter to get rid of the light polution.

That's why I'm asking, I'm confused at the moment.

Regards,

Mert

 

Hi Mert,

Does the camera maker provide information on the correct Bayer mask? It could very well be that RGGB is the correct one, and that simply the combination of your sky conditions and filter used, makes the result very green.  Best way to know if you have the correct mask is to apply Background Calibration to your stacked result or simply on an individual light frame. Background Calibration is one of the Tools in the TOOLS tab. That is more accurate than the background neutralization option below the histogram. After background calibration the sky should be dark gray and the bright stars should be blue and the smaller stars red. Then you know for sure it is correct.

Let me know if this helps 😉 or if you want me to have a look at your data as well.

Mabula

@mabula-admin  Hi Mabula,

Yes, the camera maker states it is RGGB.

I was quite confused seeing soo strong green cast over the integration.

When I used my ASI1600MCC there was no such strong green cast but as you say,

and very likely, the camera is much more sensitive in green then in the rest.

But then again, using the background neutralization things go back to normal again.

Also true is that the skybackground from my balcony is horrible, most of the

ties between Bortle 7 and 8 ( mostly above 8 )

Thanks for your help, much apreciated!

Mert

PD: an example image of the SQM seen from my balcony. 🙁

( This with my DIY observationconditions device plus it's ascom driver )

I have the same Touptek camera. These are my settings in tab 0 and I have neutralize background checked. Never had a green cast.

Thanks a lot Tom, I will reprocess accordingly and see what happens.

Only thing that comes to my mind is the white balance of the camera that

can not be adjusted in the driver(s). ( at least not in the versions I tried )

I think the camera white balance checkbox only applies to DSLRs and system cameras. I wouldn’t bother too much about that.

Just did a quick test on 12 light frames, with masterflat, masterbias.

When I don't check the background neutralization in the result window I get

the following view:

Likely not correct?

Regards,

Mert

@lammertus As Stefan and I suggested earlier: check the ‘neutralize background’ option.

Thanks, I already use the background neutralization option.

@lammertus And then the result is ok?

Posted by: @tvanpeer

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I think the camera white balance checkbox only applies to DSLRs and system cameras. I wouldn’t bother too much about that.

Indeed, the camera white balance and the camera model matrix only apply to regular consumer camera's from Canon, Nikon, Sony etc...

Posted by: @lammertus

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Just did a quick test on 12 light frames, with masterflat, masterbias.

When I don't check the background neutralization in the result window I get

the following view:

Likely not correct?

Regards,

Mert

Hi @lammertus,

In 5) Normalize, what settings do you use? Is the Background neutralization on or not? If it is on, and you get a green result like that, there is certainly a problem here with your data or a bug in APP somehow.

Mabula

@mabula-admin Hi Mabula, sorry to have seen your reply soo late! I only got the green result when Normalize background was NOT selected.

So everything is ok,

Thanks for your help!

@tvanpeer Yes, thanks! Just saw your question, I don't enter very often

in the forum.