Ricoh A12 Benutzerhandbuch

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[Distortion Correction]
You can correct distortion in an image by selecting [Barrel] or [Pincushion] 
and then selecting [Strong], [Medium], or [Weak].
 Caution ----------------------------------------------------------------------------------
You cannot make corrections to images displayed on the picture display or 
to RAW images.
[Color shading correction]
You can correct the color tones in the four corners of the image. You can 
correct in a range between -4 and +4 for both R and B.