Canon 300 HS - Manual (Page 92)

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The camera can detect areas in the scene, such as faces or backgrounds,
that are too bright or dark and automatically adjust them to the optimum
brightness when shooting. Also, when the overall image is lacking in contrast,
the camera will automatically correct the image for a sharper impression
when shooting.
Choose [i-Contrast].
∆ Press the n button, choose the 4
tab, and then choose the [i-Contrast] menu
item. Press the
qr buttons to choose
[Auto].
Once set, @ will appear on the screen.
Correcting the Brightness and Shooting (i-Contrast)
Under some conditions, the image may appear coarse or may not be
corrected properly.
You can correct recorded images (p. 131) .