calibrador
Borinot sense trellat
Parece que la noticia de Fox España, no está confirmada todavía.
En avsforum no están muy contentos con los jvc (los últimos modelos)... Las conclusiones previas es que cuanto ya tienes una pantalla de alto contraste nativo, el HDR no implica una mejora necesariamente.
Pero es que también hay dudas sobre si el reproductor Samsung está haciendo un buen trabajo.
The big keyword for this build is HDR. I suppose many users might not know how it works exactly, so some explanations:
1) First of all, this madVR build does *not* aim to send HDR content untouched to the display, to let a "HDR compatible" display do all the processing. Doing that might be supported by some future version (as an option). But for now what madVR does is convert the HDR content in such a way that it looks well on *any* display (new and old), regardless of whether the display officially supports HDR or not.
2) The key idea of HDR is to increase the peak white luminance, so that we can get brighter highlights, and more texture detail in bright image areas. HDR content uses 10bit (or more) instead of the usual 8bit, and it also uses an improved transfer (gamma) function, which means we also get better shadow detail at the same time.
3) HDR content is encoded using a totally different transfer ("gamma") curve. So playing HDR content with a media player and display which don't understand the new transfer function won't look good/correct. It will look totally washed out.
4) The new transfer function directly maps each pixel to a specific desired luminance value (in "nits" or cd/m²). Possible values are 0 nits up to 10,000 nits. However, videos don't have to use the full 0 - 10,000 range, they often top out at either 4,000 nits or 1,200 nits (from what I've seen).
5) UHD Blu-Ray will usually be encoded in BT.2020 color space, which is extremely wide. However, videos don't have to use the full BT.2020 space, they usually only use DCI-P3, inside of the encoded BT.2020 container.
6) Today's displays (even the best of the best) cannot really properly reproduce HDR content. E.g. many display's don't reach full DCI-P3 colors yet (let alone BT.2020), and no available display today comes even close to be able to output 10,000 nits! Which means that someone somewhere has to convert the HDR content down to something the display can handle. The consumer electronics world plans that the display will do this conversion (only new models, obviously) - and every TV manufacturer will write their own conversion algorithms because there's no standard for that! From what I've been told those conversion algorithms (at least for the first few HDR display generations) are probably not going to be very high quality.
7) madVR is able to compress both the luminance and the colors down to what your display can handle. It uses reasonably high quality algorithms for that. I might find even better algorithms in the future, but for now these algorithms should be a good starting point.
8) UHD Blu-Rays will come with an updated copy protection. So madVR will not be able to play them - unless the copy protection gets broken at some point.
If you want to test HDR playback, please update to a new LAV nightly build because only the latest LAV nightlies are able to pass some HDR metadata information to madVR!
(P.S: There's also a new "madTestPatternSource" version available with some HDR test patterns. Link see first post in this thread.)
So far no one has done a truly objective look at what HDR content truly means. Therefore, I did some tests last night to demonstrate what “HDR” truly means with respect to the new UHD HDR Blu ray format.
The first thing I want to demonstrate is that the actual HDR content contains additional data or image detail that is not in the standard 1080p Blu ray. This data can be displayed by ANY TV whether it has the HDMI 2.0a capabilities that allow it to read the HDR header information or not.
The images below show the maximum amount of shadow detail you can extract from a scene in the movie the Martian(Approximately 59:45 into the movie). With the 1080p Blu ray you can see that half of Mars is literally clipped into Black. If you adjust the settings here the black background will bloom above zero black but it will not show any more useful detail of the portion that is in the shadow.
Esto también lo han puesto en el hilo de ediciones The Martian
An Objective look at HDR.
So far no one has done a truly objective look at what HDR content truly means. Therefore, I did some tests last night to demonstrate what “HDR” truly means with respect to the new UHD HDR Blu ray format.
The first thing I want to demonstrate is that the actual HDR content contains additional data or image detail that is not in the standard 1080p Blu ray. This data can be displayed by ANY TV whether it has the HDMI 2.0a capabilities that allow it to read the HDR header information or not.
The images below show the maximum amount of shadow detail you can extract from a scene in the movie the Martian(Approximately 59:45 into the movie). With the 1080p Blu ray you can see that half of Mars is literally clipped into Black. If you adjust the settings here the black background will bloom above zero black but it will not show any more useful detail of the portion that is in the shadow.
BD
Ultra HD HDR
El hilo para al que le pueda interesar seguirlo
http://www.avsforum.com/forum/166-lcd-flat-panel-displays/2337961-objective-look-hdr.html
Esto también lo han puesto en el hilo de ediciones The Martian
A la vista de estas imágenes es fácil ver que paradójicamente el "alto rango dinámico" HDR no deja de ser en realidad un compresor dinámico. Que en la imagen del UltraHD HDR aparezcan más estrellas y más detalle en la sombra del planeta no es necesariamente deseable ni una demostración de mayor calidad visual.
El HDR, de la manera que se aplica aquí, es un " truco" que está llevando al huerto a mucha gente pero cuyo resultado es una imagen menos dinámica, mucho más plana y con menos punch que la foto del BD. Es mi humilde opinión.