En la última review que se ha publicado hacen una clara referencia al problema:
http://www.hdtvtest.co.uk/news/panas...1106061171.htm
Un extracto:
"Of course, there is still the issue of low-level gamma fluctuation, which is certainly the cloud hanging over the 2011 Panasonic Plasma range. Watch some dark scenes in a darkened viewing environment, and you might notice the TX-P50VT30 make a quick adjustment to Gamma a few seconds into a scene (the image may get slightly darker or brighter overall). We actually ran into this during Greyscale calibration, and in this case the shift was triggered by simply displaying the TV’s own picture adjustment menu. All online evidence (analysis of patents filed by companies developing Plasma technology) points to this being a side-effect of Panasonic’s Plasma driving method – in other words, a by-product of how the panel displays images, rather than a misguided attempt to sell TVs at the expense of image accuracy. It would appear that, at the time of writing, the only alternatives to this would be to produce a Plasma TV with a considerably brighter black level or to produce one with a very short lifespan – meaning that these small brightness shifts are very much the lesser of other potential evils.
One thing we’re not totally sure of, however, is why the television isn’t buffering frames and “looking ahead” to pick the most appropriate screen drawing mode ahead of time. In many cases, the TX-P50VT30B would shift gamma just after a scene change. Given that instantaneous response isn’t necessary outside of video game usage, wouldn’t it be possible to align most of the shifts to correspond with scene cuts and hide them from the viewer? We’re sure Panasonic has thought of this, of course."
Como venimos comentando todo apunta a que es producto de una "característica" de diseño de panel, pero que debería poder reducirse alineando los cambios de brillo con la escena.
Saludos