What They Say
SMPTE published an article in the Motion Imaging Journal that reported on tests that look at the development of objective metrics to evaluate the drop in quality of images encoded using HLG. Although there are metrics, the paper said that these ignore the chroma components for their calculations, that is, they consider only the luminance channel. The researchers found that there are perceivable distortions and when evaluated using HDR metrics, they are not detected. The group reports a surprising result that the visual information fidelity (VIF) metric, which only uses the luminance channel correlates much better with the subjective evaluation scores than the metrics investigated that do consider the color components .
What We Think
This work just highlights the complications of human perception! (BR)
