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Projector flux from color primaries



Edward F. Kelley


A standard methodology exists for estimating the flux from front projection displays by sampling the projected illuminance of a white source signal. With the advent and use of white projection primaries, a dramatic increase in flux can be achieved over the combination of red, green, and blue primaries alone. However, saturated-color areas in an image are constrained to low flux levels relative to the display maximum and further undergo a perceptual compression in relative lightness when a white primary is used. As a result, bright saturated colors cannot be rendered accurately and the appearance of full-color imagery is distorted. The display of color-accurate imagery does not generally use the white primary due to these problems. We verify a measurement method that fills the need for providing an equivalent flux measurement that will better describe the performance of all RGB and RGBW projectors when rendering full-color imagery.
Proceedings Title
Digest of Technical Papers of the Society for Information Display International Symposium
Conference Dates
May 31-June 5, 2009
Conference Location
San Antonio, TX
Conference Title
SID International Symposium


color output, light output, nonatile trisequence patterns, projector flux measurement


Kelley, E. (2009), Projector flux from color primaries, Digest of Technical Papers of the Society for Information Display International Symposium, San Antonio, TX, [online], (Accessed July 14, 2024)


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Created May 2, 2009, Updated February 19, 2017