Pentax K-r Operating Manual page 68

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 areas.
1
Press the INFO button in the status screen.
The control panel appears.
Press the INFO button when the status screen is not displayed.
2 Use the four-way controller (A • _1•) to select [Highlight
Correction] and press the OK button.
The [Highlight Correction] screen appears.
3 Use the four-way controller (4 • )
to select [Off] or [On].
z_ Press the
OK
button.
The camera returns to the control panel.