EOS/Ti and dslr-in-general users. Keep it simple.
Forget about in-camera bias and dark frames. They'll introduce further artefacts, noise in particular. Instead, simply subtract the bias value [1] as follows.
Here I'm using a modern EOS with an offset of 2048. Earlier models [2] used 1024.
1. Calibration of flat frames
Convert all your raw files to fits files using Siril's Conversion tab
Load the flat frame sequence.
Calibrate as follows:
Now stack to get the master flat frame. The default is: pp_flat_stacked.fits
Load the light frame sequence, then, leaving the bias value intact, include your newly stacked flat frame from (1) above:
Don't forget to check debayer.
Register then stack.
[2] 450d and older. There maybe others, but it's easy to check as above anyway.
That's it.
[1] How do I find or check the offset?
- Take a raw frame in total darkness with a shutter of 1/4000s or 1/8000s
- Convert it to fits using the conversion tab
- Open in Siril
- Tools -> Image Analysis -> Statistics (on older versions: right click the image -> Statistics)
The origin of the 2048 should now be self explanatory
[2] 450d and older. There maybe others, but it's easy to check as above anyway.
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