pixinsight help - stacking RGB

[blinky]

I have 13 RGB (from my QHY8) FIT's, I have calibrated them with a master BIAS, and then stacked but the resulting image is greyscale. If I open the Screen Transfer Function I can see that the RGB chanels have a red cross next to them - I assume I have missed a tick box or something that allows me to stack RGB but I cant see where:confused:

[blinky]

Just dawned on me - I will need to Debayer! Now.... do I do this before or after stacking and calibration? And what settings do I use for a QHY8?

[Dougie]

I Debayer after Calibration.

For my SXVR-H9C I use Bilinear for the Bayer method and BGGR for the Bayer / Mosaic pattern.

The pattern could be different for the QHY8.

I struggled to find any information for my camera and the only way was through trial and error.

I went through all the patterns and processed each test up to Histogram Stretch.

Finally arriving at the correct pattern.

[blinky]

Seems to be RGGB but I now get no colour until I do a saturation stretch then the colour is horrible - Does it matter at what stage I Debayer? I did it after stacking etc

[blinky]

This is what I get......

[harry page]

Hi

You must debayer each sub before stacking

Harry

[blinky]

OK Harry, just did that, then went to combine them and the combined image is back to mono? The RGB sliders have a cross in them on the screen transfer function - what am I missing????

[harry page]

Hi

ok not sure what is wrong

You have debayered each individual sub and saved them in some temp file ?

You than register them and finaly stack them ( intergration )

Is this what you are doing

Harry

[blinky]

Ah.... No I registered, then debayered then stacked!

Will give that a go but have to leave for a family gathering!!!! Will try later this evening - Cheers Harry!!!

[blinky]

What about image calibration - before or after debayering?

[blinky]

Figured it all out - When I was debayering I was using an image container and dragging it to the debayer process. This seemed to work asI could open the debayered images in Deep Sky Stacker and they were in colour, I then opened one in PI and it was grey Then I looked at DSS again and although the on screen image was in colour the info said 'Grey 32bit'. It seems that although the image container/debayer works, it saves in the same format, i.e. Greyscale. I have just found the debayer script and that seems to have worked......

[blinky]

Also seems that DSS says the QHY8 is GRRB matrix but if I do this in PI I get a green image, I just selected GBRG and it looks much more like what I would expect it to!

[Tim]

It is GBRG Craig.

[blinky]

How strange, wonder how DSS gets it correct then? Maybe since I selected the QHY8 camera it knows to overide the selected setting? That also explains why Debayering in Maxim never worked either!