SIGMA DP3 Quattro - Manual (Page 83)

83
TONE CONTROL
By automatically optimizing the tone curve according to the scene, even for
the scene with high contrast, the image can have a natural tone.
Tone Control : Off Tone Control : Strong
Set from [ Capture Settings] (P.27) → [Tone Control]
OFF Off Set Tone Control function OFF.
Mild (Default) Mild effect can be achieved.
Strong Strong effect can be achieved.
CAUTION !!

Depending on the scene, noise may be visible due to the correction
effect. In such case, set it to [ Off].