Y nunca pretendí afirmar que se vieran mal sin posibilidad de poder verse bien. Lo único que comenté fue que si podría ser debido a que se necesiten varios ajustes para los UHDS. Porque eso precisamente es lo que yo había leído, como por ejemplo en Proyector Central, que lo dicen bien claro. Ahora bien, si mienten, se equivocan o no, no lo sé, porque ver esos aparatos yo no los he visto a pesar de haber sido invitado en varias ocasiones en mi misma ciudad a verlos en correctas condiciones. Mi experiencia empieza y acaba en un LS-10500, y coincide con esa review de JVC, que se necesitan varios ajustes personalizados.
Esto es lo que dicen en Proyector Central:
09-06-2017
High Dynamic Range -- HDR. The RS520 is capable of producing a very bright, high contrast HDR picture with the right source material. In point of fact, it has all the muscle you need to get an extremely satisfying HDR picture that does not look fake or overprocessed.
The right source material is the key, as at the moment 4K HDR varies in quality even more than SDR 1080p. There are no production standards for HDR discs and output levels are all over the map. So any given 4K HDR disc or stream may look anywhere from perfect to terrible with the RS520's HDR calibrations. As an example, if you pop
The Martian (4K HDR) into the
OPPO UDP-203 it looks pretty much perfect on the RS520 with its factory preset HDR mode. It is extremely sharp, clear, low noise, and very high but not over the top contrast. No adjustments necessary, just sit back and enjoy.
At the opposite end of the spectrum is the documentary
Rocky Mountain Express (4K UHD, w/ HDR). Now this looks spectacular on the RS520, but only
after serious adjustment of the picture controls. When you first load this disc, the picture is way oversaturated and the highlights are ridiculously blown out. To illustrate the magnitude of the error, we reduced the Contrast slider from 0 to -25, and Color from 0 to -14, and ended up with a beautiful, much more naturally balanced image (outstanding, actually).
Moving on to a third disc, when we loaded
The Bourne Ultimatum, both the shadow details were crushed
and the highlights were blown out. When the RS520's Brightness control is boosted to +8 they open up sufficiently to be watchable without compromising black levels to the point that they look muddy. Pulling down Contrast to -2 helps bring back highlight detail. So the level output error on this disc is entirely different than the error on Rocky Mountain Express. There is no such thing as an HDR calibration that makes all three of these discs look good.
Technically the better way to do HDR calibration, rather than adjusting Contrast and Brightness, is via the Gamma (HDR.ST2084) controls. If you open those up you get three sliders that control Picture Tone, Dark Level, and Bright Level. These can control either White or the individual R, G, and B channels.
Either way, there are relatively simple adjustments to picture controls to accommodate the radically different output levels that vary from disc to disc. And be prepared for the fact that some 4K HDR discs are terrible and cannot be fixed.
Labyrinth is a disaster -- low contrast, not at all sharp for 4K, and exceptionally noisy. There is no way to make this disc look good on any projector. So a source labeled "4K HDR" guarantees nothing about image quality.
Of course, this is not the RS520's fault, but rather the flaky disarray of the HDR sources. As far as the JVC RS520 itself is concerned, it has everything you need to optimize HDR viewing, and the better the source the better the picture. Just be aware that the HDR preset is not a "one-size-fits-all" setting, and you may be doing more calibration on the fly than you've needed to do in the past to get individual HDR sources to look good.
Review: JVC DLA-RS520