Originally posted by felix68 No, your suspicions are not correct. Raw files are a direct dump of the sensor data without any processing applied.
This is true in general, but people who have carefully examined the actual contents of Pentax RAW files have discovered a few exceptions:
- On the *ist series (and that series only, if I recall correctly), WB *is* partially applied to the RAW data. Not in the sense of totally correcting the color, but more some sort of shift to avoid clipping. I forget the specifics, but it seemed to have been proved pretty conclusively. The gist of it was that using AWB or the "wrong" setting wouldn't screw anything up - you'd be getting the results straight from the ADC - but actually choosing the tungsten present would result in, hmm, maybe less gain on the amplifiers on the red channel to avoid clipping? Something like that, anyhow. The effect was small but measurable, and only on the *ist series (or perhaps K100D/K110D too). Nothing like the huge difference WB makes for JPEG.
- On the K20D, *some* NR is applied at ISO 1600 even if you turn off the high ISO NR option.
- On all models, dark frame subtraction (slow shutter speed NR) is performed even in RAW
There is also the possibility that on some camera models, things like D-range may be implemented such that the results are actually reflected in the RAW file.