ORF to FITS conversion bag?

Tomasz_Grabowski · February 14, 2025, 5:41am

It was only after 4 hours of integration that I noticed that my photo was broken because the .orf files (OM System OM-1 Mark I camera) were converting incorrectly to fits format. A strange regural pattern appears on the photos.

See screenshots in the following magnifications.

The problem does not exist when the intermediate step is to convert .orf > .tiff > .fits. I can’t tell if the orf files themselves are corrupted in some way. I assume that since the tiffs generate the correct fits files - they are not. But there is an other problem - why calibration frames are in color?

The error affects both Siril and online available converters and files created by indiserver+libraw+Ekos (in the latest versions).

Are there any settings to avoid this error, rather than forcing me to waste the time and disk space needed to convert via tiff?

lock042 · February 14, 2025, 6:57am

This pattern is normal. This is the Bayer pattern.m of the CFA image.
You should take a look at the documentation.
The pattern should disappear after demosaicing which is done after calibration.
But again, everything is explained in the doc.

Tomasz_Grabowski · February 14, 2025, 7:30am

I’ve followed this tutorial. And this pattern was kept in images till the end as I recall - I can’t check it now. But in r_pp_ it was present (almost) for sure. I will check what does OSC scripts will do.

Can you be so kind and point me to the documentation part about this?

And the question on a side: why tiffs produce color calibration frames? What should I do to avoid that? I could not find anything about this subject on documentation and web. Maybe I am searching in a wrong direction.

lock042 · February 14, 2025, 7:44am

You probably forgot to check the de debayer button.

The tiff are already demosaiced. You should not use TIFF in the calibration process. Never

Tomasz_Grabowski · February 14, 2025, 8:09am

Thank. you!