Pentax K-5 Operating Manual page 141

The camera and lens properties can be automatically adjusted for when
taking pictures.
Adjusts the brightness and reduces the occurrence of overexposed and
underexposed areas.
Expands the dynamic range and enables a more ample gradation
expression by the CMOS sensor and reduces the occurrence of
overexposed and underexposed areas.
I
2
3
Select [D-Range Setting] in the [1_1 Rec. Mode 3] menu and
press the four-way controller ( • ).
The [D-Range Setting] screen appears.
Use the four-way controller (A •) to select [Highlight
Correction] and press the four-way controller ( • ).
Use the four-way controller (• •)
to select [Off] or [On] and press
the OK button.
Use the four-way controller (• •) to select [Shadow
Correction] and press the four-way controller ( • ).