ETTR & under-expose: darktable manual inconsistency?

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solitone
solitone Regular Member • Posts: 129
ETTR & under-expose: darktable manual inconsistency?
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After editing my shots with OM Workspace for a few months, I'm learning darktable, and it seems promising, I like it. I've watched several video tutorials, and now I'm reading the user manual.

I have a newbie question regarding a sentence I find in the introductory section--darktable 4.0 manual suggests to take a well-exposed photograph, and states that:

Where possible, you are advised to use exposure to-the-right (ETTR) techniques to maximize the amount of data available for processing. As a general rule of thumb, it is safe to under-expose all images by 0.5 to 1 EV (by reducing the ISO sensitivity if possible) even if the in-camera preview looks darker than expected (the preview is not the raw data).

I don't get this. The two points seem contradictory to me. ETTR would imply over-exposure. Is the manual suggesting to over- or under-expose?

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