How to debayer a single shot fits file?

[jkoenig72]

How to debayer a single shot fits file?

[mlnoga]

Hi Jörg, nightlight is a stacker at heart. So the current process is to 1. extract and stack the R channel, 2. same for G, 3. same for B, and then 4. combine the mono channels into an RGB image.

./nightlight -out outR.fits -debayer R -cfa RGGB -align 0 stack ../images/ccd_image25.fits does the first step. Then ./nightlight -out outG.fits -debayer G -cfa RGGB -align 0 stack ../images/ccd_image25.fits and ./nightlight -out outB.fits -debayer B -cfa RGGB -align 0 stack ../images/ccd_image25.fits.

Where RGGB is the color filter array sequence for your camera. If you're not sure about sequence, look at the debayered green channel first. If it still shows a mosaic, or two background histogram peaks, try another value. Once that works, look at the stacked picture and see if known red stars are indeed red. if they are blue, swap R and B in the cfa. Once you know the value for your camera, you know it for all future runs.

Finally ./nightlight -out out.fits rgb outR.fits outG.fits outB.fits.

If you regularly need this, might want to add a command like rgbsingle. However, most people tend to want to stack multiple exposures for each color channel.

Hope this helps!

[jkoenig72]

I understand, maybe I should have explained why I'm asking... :-)

There is this nice allsky cam project by Thomas:

https://github.com/thomasjacquin/allsky.git

Sadly this is only for ZWO cams from now, by using their SDK. I would like to replace that with some indilib client. But here you get "only" fits - mostly debayered. So I was trying to get a nice easy way of debayering those fits into good quality jpeg or png. Actually I find it hard to get some good debayering tools / examples, working on command line. Its not only the debayering, its also the histogram stretching.

Just getting an image as a fits, run some python opencv script or your tool convert into a good quality jpg - then all the rest of Thomas scrips etc. can stay same, just replacing image capturing.

So what if I take the same image 3 times? Debayermask is GBRG... would that work? I will give it a try later today.

Thanks!

Very nice project you have here.

[mlnoga]

Closing due to lack of activity.