Canon PowerShot G10 - Manual (Page 186)

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z 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.
z Overwriting cannot be performed on protected images.
z When there is not enough space left on the memory card,
red-eye correction cannot be performed.
z Although you can apply red-eye correction any number of
times to an image, the image quality will gradually deteriorate
with each application.
z 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.