Distortion Correction - Canon EOS 5D Mark III Instruction Manual

Color space (p.158)

You can select either sRGB or Adobe RGB. Since the camera's LCD
monitor is not compatible with Adobe RGB, the image will not look
very different when either color space is set.
Peripheral illumination correction (p.147)

If [Enable] is set, the corrected image will be displayed. If the effect
is difficult to discern, press the <u> button to magnify the image
and check the corners. (Press the <u> button to return to the
normal view.) The peripheral illumination correction applied with the
camera will be less pronounced than with Digital Photo Professional
(provided software) and may be less apparent. In such a case, use
Digital Photo Professional to apply the peripheral illumination
correction.

Distortion correction


When [Enable] is set, image distortion due to the lens
characteristics is corrected. If [Enable] is set, the corrected image
will be displayed. The image periphery will be cropped in the
corrected image.
Since the image resolution may look slightly lower, use the Picture
Style's Sharpness parameter to make adjustments as necessary.
When processing images with [Distortion correction] set to [Enable], AF
point display information (p.247) and Dust Delete data (p.291) will not be
appended to the image.
R Processing RAW Images with the CameraN
285