BPP : Warning in case Missing Bias Files but present Flats on Canon 6D

[miska]

Hi,

I use BPP and it works great. However, in one particular case, I think there should be an extra warning, or it should not even start.
I use Canon 6D files. It is well known that Canon has a fixed bias value in their raw data.

My problem: IF you don't input some bias files in BPP, but still use flats, then you basically get garbage out. Very blotchy images, with big rings around the center. Completely unusable.

So my suggestion:
- When BPP detects that it is using Canon data, and bias files are not given, just generate a constant bias over the whole image with the appropriate (Canon) value.
- If that is not possible, put a big warning that No Bias + Flats + Canon RAW --> Disaster.

It took me a while to figure this one out. Of course, one should always use all the calibration frames, but I thought that bias is not such a big deal...

[Carlos Milovic]

I often wonder why people try to do such shortcuts in the calibration stage. Just take all of them. They are cheap (specially bias frames). It is not like old times when we had to get our rolls to the laboratory and pay for each frame... and film was non-linear so flat fielding was a real PITA.
Take full advantage of what you have. Fully calibrate the data.

[Juan Conejero]

Take full advantage of what you have. Fully calibrate the data.

Absolutely!

BTW, moving this thread to the wish list board.