Canon PowerShot G7 X Mark III, Advanced User'S Manual, Page: 130 / 329

Shooting Bright Subjects (Highlight
Tone Priority)
Improve gradation in bright image areas to avoid loss of detail in subject
highlights.
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[Highlight tone priority]
z
Setting highlight tone priority to [D+] or [D+2] will prevent you from setting
ISO speeds lower than [200]. Auto Lighting Optimizer is also set to [
]
and cannot be changed, in this case.
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Under some shooting conditions, images may not look as expected even if
you choose [D+2].
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