Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 193)

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You can reduce overexposed, clipped highlights.
1
Select [Highlight tone priority].
Under the [ z 2 ] tab, select
[ Highlight tone priority ], then press
< 0 >.
2
Select [Enable].
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
When [ Enable ] is set, noise may increase slightly.
With [ Enable ], the settable ISO speed range will start from ISO 200.
Expanded ISO speeds cannot be set.
When multiple exposures (p.248) is set, [ Highlight tone priority ] will be
automatically switched to [ Disable ].
When highlight tone priority has been set, < A > is displayed in the
viewfinder and on the top LCD panel.