OSC Image - No Colour... Help!!

[Aidan]

Evening All,

I'm having a few problems here..  Generally i image using a mono camera both LRGB and NB.  Stacking (be it in DSS or PI) normally works fine and i can bring out an image which looks half decent with some nice colour.

Last night was the first real attempt at using a One Shot Colour - Starlight Express SXVR M25C.   I have done a few test shots in the past and with some help worked out the Bayer Matrix - which is GBRG.

I have tried stacking in DSS and PI - both with the debayer set to GBRG.   When i then start to process the image, i can not get any colours which are typical of the target - which is M31.

I'm pretty much at a lose end on where to go from here.  Either i am doing something fundamentally wrong, or something in the stacking/debayering process is going amiss.

Here is a link to an image which has been stacked in DSS:  https://www.dropbox.com/s/jpsyim0ox3ogndn/DSS_Stacked.TIF?dl=0

If someone has a few mins and would be kind enought to have a look and see where things might be going wrong it would surely be appreciated.

Rgds
Aidan

[Skipper Billy]

Can you post a single frame - untouched in any way - it looks as though the wrong colours are mapped to the wrong channels.

I am not familiar with DSS but if you post an untouched single sub I can have a look which Bayer matrix works on it.

Have you tried BGGR - some time ago I had the same camera and vaguely remember that the correct matrix sounded like a naughty word which helped me to remember it !!

[steppenwolf]

I have tried to download your TIF file and open it in PS and MaxIm without success but I suspect that this is an offset issue. Perhaps you could post up a single FITS file before any processing/debayering has taken place to dropbox. I have an M25C and find it very good so I feel sure this can be sorted.

[Aidan]

Thanks chaps,

i know we looked at this a few months ago steve when i was looking to get and eventually go thte sxvr 25.   At the time i only had a few frames to work with.  As requested, a single frame direct from the camera

https://www.dropbox.com/s/sg6bt7jsmymjy63/M31_OSC_Light_27_10_2017_214825_Starlight Xpress M25C_None_0600_frame13_1x1_-19C.fit?dl=0

Rgds
Aidan

[vlaiv]

I just downloaded your image, and it looks like you've chosen wrong Bayer matrix settings. But all is not lost

Just swap red and blue channels and image will be ok (although it will need color calibration, white balance)

So proper setting for Bayer matrix should be: GRBG

[Aidan]

Thanks,  I'm running that throught PI now.   I'm pretty sure i did try this matrix and found the bayer grid was still visible in the image once stacked etc.   Lets see what comes out in a few mins. 

[Aidan]

Thats much better using that combination for this image set.    Where i have got so confused is when i was trying to work out the correct matrix using an image from the camera earlier in the year, If i use the matrix that i started with GBRG the image came out debayered.   If i used the the suggested Vlaiv you could see the grid.  

But, this seems to be ok now using GRBG.

Rgds
Aidan

[steppenwolf]

Pleased you got it sorted, Aidan, enjoy your new camera.

[LightBucket]

I realis this is thread is a little old, but am having issues with this same camera, but using INDI software, and have found that the bayer pattern is RGGB, is this correct..?