Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 219)

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Highlight Tone Priority Settings
You can reduce overexposed, clipped highlights.
1 Select [ z : Highlight tone priority].
2 Set an option.
 [Enable] : Improves gradation in
highlights. The gradation between the
grays and highlights becomes smoother.
 [Enhanced] : Reduces overexposed
highlights even more than [Enable] ,
under some shooting conditions.
o
Noise may increase slightly.
o
The available ISO range starts at ISO 200. Expanded ISO speeds cannot be
set.
o [Enhanced] is not available when recording movies.
o
With [Enhanced] , results in some scenes may not look as expected.