What They Say
SMPTE’s Motion Imaging Journal has taken a special look at HDR this month and has a number of interesting articles on the topic. Our eye was particularly caught by this one which details a computational model that can predict the impact of the Helmholtz Kohlrausch (H-K effect).
(Basically, the H-K effect is an artefact of human vision where very saturated colours, especially red and blue, look brighter than less saturated colours, even though they may have the same luminance).
The researchers suggest that their methodology can be used by display makers to measure and predict brightness as a function of colorfulness to optimize luminance—notably for reducing power—in displays with spectrally pure primaries .
What We Think
The lead author of the report is Dale Stolizka who is senior principal engineer at Samsung Display R&D USA. (BR)
Each color on top has approximately the same luminance level and yet they do not appear equally bright or dark. The yellow (second from the left) appears to be much darker than the magenta (right-most). However, when the top image is converted to grayscale, we have the image on the bottom–a single shade of gray. Source:Wikipedia
