Canon EOS-1D C - Manual (Page 154)

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You can minimize overexposed highlight areas.
1
Select [Highlight tone priority].
Under the [z2] tab, select
[Highlight tone priority], then press
<0>.
2
Select [Enable].
Turn the <5> dial to select [Enable],
then press <0>.
Highlight details are improved. The
dynamic range is expanded from the
standard 18% gray to bright
highlights. The gradation between the
grays and highlights becomes
smoother.
3
Take the picture.
The image will be recorded with
highlight tone priority applied.
3
Highlight Tone Priority
With [Enable], the Auto Lighting Optimizer (p.150) is automatically set to
[Disable] and the setting cannot be changed. When [Highlight tone
priority] is set to [Disable], the Auto Lighting Optimizer will revert to its
original setting.
With [Enable], image noise may increase slightly more than with
[Disable].
With [Enable], the settable range will be ISO 200 - 51200 (ISO 200 - 25600
for movie shooting). Also, the <A> icon will be displayed in the viewfinder
and on the top LCD panel when highlight tone priority is enabled.
COP
Y