Filmic RGB's blackpoint / whitepoint measurement

[Tamas_Papp (Tamas K. Papp)]

@Neutral_Gray

the calculated dynamic range of the source image (called “EV scene” in the graphic display) should not be dictated by the given scene but (originally) by the film material or the digital sensor’s potential dynamic range.

I agree with @rvietor here — I think this assumption is false.

There was a recent discussion in another topic, I will just link what I wrote instead of repeating it here:

How best to decide if tone mapping is required

I think you are on the wrong track here. First, sensor dynamic range is an ill-defined concept. Sure, you have the number of bits recorded from the sensor, and you can simply take \log_2, but that does not map to anything useful since the last few bits are surely going to be noise, which is a big problem in the shadows because relative to the signal, the noise will be overwhelming. Second, what you are deciding in practice is where the contrast should be distributed globally. You are choosing…

TL;DR:

1. all mapping is about distributing (global) contrast, of which there is a finite amount.

2. bring everything to the relevant tonal range before global tone mapping. trying to fix things at that stage is a futile exercise.

3. consider sigmoid.