I started from scratch with your original raw file, used the “3 - DxO Optical Corrections only” preset from PL 9.6, and applied XD3 with the default values.
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Export to DNG (full size) and TIFF (16bit)
In direct comparison to the TIFF file, the DNG output appears ever so slightly brighter in both the shadows and the highlights (a difference of 2 to 3 in the RGB channels) … also visible when comparing the histogram. -
Applied a Tone curve to the original raw file
and exported as DNG (full size) and TIFF (16bit).
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The exported DNG output file looks exactly the same as the export without exposure correction, whereas the new TIFF output corresponds to the exposure correction. -
Applied the same Tone curve settings as before to the new, but unchanged, DNG file and exported again.
In direct comparison with the already corrected TIFF file, the DNG output now appears ever so slightly brighter in the highlights and slightly darker in the shadows, as if the tonal range were larger ( → Histogram).
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Maybe you had seen this or when you applied exposure corrections to the unmodified TIFF file other differences, which you can expect when applying the same settings to “different” files ( → Histogram).
In the present image, most of the area is in shadow (underexposed). Although the images initially differ just slightly, the few existing dark tones are distributed differently by applying this steep curve. – Whether this is of practical relevance depends on what you want to achieve.
Personally, I see no advantage in saving a file in DNG format if I then have to make exposure corrections. – Yes, the comparatively small file size of the compressed DNG format certainly has its advantages, but I didn’t use it.
Everything important regarding the available color space differences has already been said.
For me, the TIFF format is a transitional format for use in the Nik Collection (if you’re coming from PL) and then the final output format … if you don’t go via PS.
I tried to follow the linked video, but unfortunately, even with the help of automatic translation, I don’t understand enough French to fully grasp the content of the discussion (in detail).
