Canon POWERSHOT G10 User Manual page 186

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Red-eye correction cannot be performed on and RAW
images. When shooting in [Record + ], red-eye
correction can be performed on the JPEG image, but the
original image cannot be overwritten.
Overwriting cannot be performed on protected images.
When there is not enough space left on the memory card,
red-eye correction cannot be performed.
Although you can apply red-eye correction any number of
times to an image, the image quality will gradually deteriorate
with each application.
Since the correction frame will not appear automatically on
images that have already been corrected once with the Red-
Eye Correction function, use the [Add Frame] option to
correct them.
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