Cinematography: Theory and Practice by Brown Blain;

Author:Brown, Blain;
Language: eng
Format: epub
Publisher: Taylor & Francis Group

ANOTHER APPROACH

Just bending and stretching the knee and shadow areas can achieve a good deal but in the end, it is a limited approach and can result in some images that look a bit unnatural. Over the years, camera manufacturers have come up with even more sophisticated ways of extending the dynamic range of video cameras.

HYPERGAMMA/CINEGAMMA/FILM REC

Manufacturers have several versions of gamma encoding variously called Hypergamma, Cinegamma, Video Rec, Film Rec, or low contrast curve, which are designed to extend the dynamic range of the camera (Figures 10.17 and 10.18). These gamma curves are usually measured in a percentage, with the range of Rec.709 as a base 100%, with typical settings of 200%, 300%, 400% and so on. The higher the dynamic range, the greater the highlight value that can be captured. For example, 400% means it can capture a highlight that is 4X (two stops) higher than 100% reflectance. Using these curves can make the use of exposure aids such as zebras difficult.

Figure 10.18. (left) Panasonic’s Film Rec curves. They are denoted as the percentage by which they extend the dynamic range.

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