Canon POWERSHOT G1X User Manual page 80

Image Effects (Creative Filters)
To replace only your specified color, choose
a large negative value. To replace colors
similar to your specified color as well, choose
a large positive value.
Press the ES_} button to return to the shooting
screen.
(_ Using the flash in this mode may cause unexpected results.
In some shooting scenes, images may look grainy and colors may
not look as expected.
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