EDIT: Ondertussen even wat verder gezocht. De waarde heeft te maken met Middle Gray.
In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about half way between black and white on a value scale; in photography, it is typically defined as 18% reflectance in visible light.
En als klap op de vuurpijl: Meters Don't See 18% Gray. You've learned an untruth. Welcome to the real world of 12% gray.Middle gray is defined as the geometric mean intensity between a white and a black intensity that are in a ratio of 60:1. That is equivalent to 12.9% of the white intensity.
Werkt de automatische belichtingsinstelling in de camera dusdanig dat de gemiddelde belichtingswaarde in het midden ligt?
It is assumed that the measurement taken by camera exposes the shot so that some of the light reflected by the object measured is equivalent to middle gray. However, many note that modern cameras generally treat 12-13% gray as "middle gray".
Waarom is er niet een mode waarbij op de maximale belichtingswaarde wordt gestuurd, en wel zover mogelijk naar rechts? Eigenlijk de vraag die ravon al eerder stelde.