GVU Technical Report Number:
GIT-GVU-92-31
Title:
Tone Reproduction for Realistic Computer Generated Images
Authors:
Jack Tumblin
Holly Rushmeier
Abstract:
Radiosity and other global illumination methods for image synthesis
calculate the 'real world' radiance values of a scene instead of the
display radiance values that will represent them. Ad-hoc conversions
cause serious errors, and give little assurance that the evoked visual
sensations are truly equivalent. Photographers devised sensation
matching methods as 'tone reproduction' using subjective judgments well
suited to film; these were adopted in turn by television and ocmputer
graphics systems with little change.
We advocate the use of better tone reproduction for computer graphics,
using mathematical models of human observers to define an explicit
conversion from real-world radiance to display device inputs. Film and
television reproduction is summarized, and an example observer model is
derived from the brightness vs. luminance functions of Stevens and
Stevens. With a brief discussion of shortcomings, we build a crude tone
reproduction operator for black and white images. The new operator is
demonstrated as a plausible solution to display range problems, and
extensions are suggested.
Keywords:
Display methods, radiosity, global illumination, tone reproduction
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