https://www.dxomark.com/About/In-depth-measurements/Measuring-sensors-using-RAW-and-testing-lenses-on-cameras/Why-use-RAW-for-measurements

これの最後、

Since users can choose their RAW converter and tune the settings to a very fine degree, and since we want to evaluate the intrinsic quality of the sensor and the lens, it is only logical to perform measurements on RAW images.

この部分の、
tune the settings to a very fine degree
を「設定を微調整」と訳してるな。

で、very fine degreeはグーグル先生によれば「非常に細かい程度」だそうだ。