If you want to play with a raw file, maybe get one from one of the Play Raw threads.
No need for that, thanks, I have the corresponding dng. The point is that this tiff is the resulting stack from a luminance hdr processing that I want to further process. I guess I should apply this basic settings you show in the video to the original bracket raws, then enter luminance hdr, then finally do some final adjustments to the resulting ldr.