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.
Article continues for subscribers...
If you’re already a subscriber, CLICK HERE TO LOG IN
diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.