Does this mean all RAW files aren't truly "RAW".
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Usually we assume raw is the data as it is delivered by the sensor.
The only case I know of where this is the case are the IA/BR files.
All other files have been processed in some ways.
I can't say what steps will have been applied to a certain format, but most likely all of the following:
Blemishes will have been corrected.
Something like a default white file will have been applied.
A black level correction of some sort will have been applied.
There are other things that could have been applied, like a kind of leveling in relation to ISO settings and whatever.
So different raw formats are differently close to the sensor data. Whether it makes a difference for the "programmer" depends on the steps applied. I.e. it's difficult to increase image quality by changing the way blemishes are removed.
Kind regards
SH