October 10, 2008
This page investigates how the use of Canon’s Highlight Tone Priority (HTP) setting affects noise in the darker areas of an image, even at ISO 200. The EOS 1Ds Mark III user manual describes Highlight Tone Priority as follows .
Improves the highlight detail. The dynamic range is expanded from the standard 18% gray to bright highlights. The gradation between grays and highlights becomes smoother.
(!) With setting 1 (enabled), noise in the shadow areas may be slightly more than usual.
Enabling Highlight Tone priority
HTP is accessed via Custom Function II-3: “C. Fn II: Image/Flash exp/Disp #3”. Choosing HTP requires a minimum of ISO 200; it cannot be used at ISO 50 or 100.
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