Highlight Tone Priority - Canon REBEL T3I EOS 600D User Manual

3 Custom Function SettingsN
C.Fn-5
Reduces the noise generated in the image. Although noise reduction is
applied at all ISO speeds, it is particularly effective at high ISO speeds. At
low ISO speeds, the noise in the shadow areas is further reduced. Change
the setting to suit the noise level.
0: Standard
1: Low
2: Strong
3: Disable
With setting 2, the maximum burst for continuous shooting will greatly
decrease.
If you playback a 1 or 1+73 image with the camera or print an
image directly, the effect of the high ISO speed noise reduction may look
minimal. You can check the noise reduction effect or print noise-reduced
images with Digital Photo Professional (provided software, p.302).
C.Fn-6
0: Disable
1: Enable
Improves the highlight detail. The dynamic range is expanded from the
standard 18% gray to bright highlights. The gradation between the grays
and highlights becomes smoother.
With setting 1, the Auto Lighting Optimizer (p.109) is automatically set to
[Disable] and the setting cannot be changed.
With setting 1, noise may become slightly more pronounced than with
setting 0.
With setting 1, the settable range will be ISO 200 - 6400.
Also, the <A> icon will be displayed on the LCD monitor and in the
viewfinder when highlight tone priority is enabled.
254
High ISO speed noise reduction

Highlight tone priority