Regarding the recent HDR presentation

There is both a correction and an elucidation for “HDR: The Great, the Okay, and the Yikes!”

Correction:  About 35:30 in, the term “ground glass” is used for what test viewers looked at during projector-illuminated tests.  Actually, it was an LCD screen being rear-illuminated by the projector.

Elucidation:  At about 26:24 in, the chart says “Peak Brightness;” as “brightness” is a perceptual term, the original chart should have been labeled “Peak Luminance.”  Since the black level was fixed, the increased luminance did indicate increased dynamic range.

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