Quattro dp0, Руководство пользователя

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JPEG files are compressed after a parameter adjustment. In the case of
the RAW format, parameter information is recorded without adjustment.
It is possible to re-adjust RAW images using Sigma Photo Pro
software.
OVEREXPOSURE CORRECTION
Blown-out highlights caused by overexposure can be
corrected, based on the gradation information obtained
through the arrangement of pixels on the sensor, to minimize
loss of detail.
Overexposure Correction : Off Overexposure Correction : On
Select [ On ] from [ Capture Settings ] (P.28)
→
[ Overexposure
Correction ].
CAUTION !!

In the following circumstances, Overexposure Correction does not work
even when you turn it [On]. (The icon on screen will turn to grey.)
A
. When shutter speed is set lower than 0.8 sec.
B
. When ISO is set
higher than ISO400.

Depending on light conditions, it cannot be adequately adjusted even
with Overexposure Correction, which causes tinting on a part of the
subject. In this case, please turn Overexposure Correction [ Off ].