This filter is used for lightning shadows and midtones of an image without blowing the highlights. A detailed tutorial can be found at Anhang D, Tone Mapping and Shadow Recovery Using GIMP’s ‘Colors/Exposure’ .
„Presets“ are a common feature for several Colors commands. You can find its description in Abschnitt 8.1.1, „Colors Common Features“.
This option is used to dispense with "useless" shadows and highlight information.
This option is used to add one or more stops of exposure compensation to the image.
These are common features described in Abschnitt 8.1.1, „Colors Common Features“.