Exactly! HDRI is 'High Dynamic Range Image', meaning it can record scenes with a much greater range of brightness than any previous recording medium, such as photo film. Ansel Adams would be delighted - no need for his Zone System.

In fact, if display monitors were as good as they should be, an Image Based Lighting (IBL) scene (one based on an HDRI image as the light source) of a bright sunny day, where you can see the sun, would throw a beam of sunlight out and illuminate your room.

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