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Sounds rather credible to me... psychovisual RD enhancements were described as taking energy from some areas with higher energy (edges and other details) and distributing it to the surrounding areas with lower energy (little detail). For cartoons, this would probably mean to take the energy from the edges of black lines and distribute it into the flat color areas. So they get undesired stripes in the same direction as close black lines.
As useful as a feature may be for natural video content, as inadequate it may turn out for artifical content. There is never one perfect set of parameters for all video content.
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