Calibrating Flats "Incompatible Geometry"

[UlteriorModem]

Greetings,

Yesterday I was preparing a new set of flats for a new filter configuration.

Using an ASI1600mc I shot the three sets of flats for three different gain and offset settings. It records images in fits format.

I then shot a set of 'dark flats' with the same gain and offset and duration as the flats. Then created a master dark flat.

When I go to calibrate the individual flat subs to the corresponding master dark flat I get the 'incompatible image geometry'.

Obviously something got rotated somehow? Maybe when I created the master dark flat?

Anyhow I remember some setting in file explorer but cant remember exactly what.

What has changed? I have been calibrating flats with master darks with no issues for years. Now all of a sudden something changed.

I am not at the machine(s) with the images or PI but wanted to put a feeler out so when I do get home I might have a better idea of where to start.

Thanks!

[aworonow]

not sure on the constraints for OSC, but maybe the images that are grayscale should be RGB, or the other way around.

[UlteriorModem]

No it is complaining about geometry not the CFA array.

I am used to seeing the 'forced' CFA message when running BPP.

[UlteriorModem]

I looked into this a little further though I dont really know what the issue is. The frames have exactly the same x & y geometry.

I 'think' it has to do with trying to apply a master dark .xisf file to the .fit flats.

Batch converted all the .fit flats to xisf and the process runs, although now it states Warning: No correlation between the master dark and target frames. This is of course due to the CFA array but the calibration routine does not force the CFA pattern. I also tried "Force CFA" and still had some error message.