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Re: Optimizar la gráfica ATI
Es la configuración que se recomienda en los HTPC si no te importa perder los WTW. Como creo que usas madVR te cito a madshi (desarrollador de ese renderer):Iniciado por Taboadax
Doom9's Forum - View Single Post - madVR - high quality video renderer (GPU assisted)My recommendation is always to set configure your display so that it expects PC levels (full range). This has 2 important benefits: (1) Levels will be correct for everything, including games, photos, applications and video playback. (2) There should be no problem with image quality.
If your display can't do PC levels, or if you have good reasons for not using this solution, then you have 2 alternative solutions:
(a) Either set the GPU to limited range and madVR to PC levels. This means madVR will render to PC levels and the GPU will afterwards stretch the madVR output (and desktop, games, applications, photos etc) to limited range. Using this approach still has the benefit of having correct levels everywhere. But image quality might suffer because the GPU usually uses a rather bad stretching algorithm, which can introduce banding artifacts.
(b) Or set the GPU to fullrange and madVR to TV levels. This will result in good image quality (no artifacts) and correct levels for video playback. However, desktop, games, applications and photos will have wrong levels.
nevcairiel, desarrollador de los LAV filters:
New TV will not accept 0-255, only outputs 16-235If your TV can actually show something blacker then a pure black of 16, shouldn't you make it display the absolute black (16) in that black for maximum contrast? Or do you like looking at a dark tone of grey? smile.gif Same goes for white, of course. If your TV supports PC scale, then it won't do any conversion or cut-off, and everything turns out fine.
If your TV does NOT support PC scale, then there are several options to deal with it :
1) Let your graphics card output 0-255, but set the video player to 16-235. That way you can actually preserve BTB and WTW for whatever it may be worth, however not all players support such a feature and your desktop outside of the video will have black and white crushed.
2) Let your graphics card output 16-235. You will also not get BTB and WTW, but your desktop will look better and it should work in all players.
Anyway, in the end there is probably no real visual difference in 0-255 or 16-235 for videos if its setup properly. I prefer 0-255 because that way I can actually look at other things on the HTPC without having it compress the colors of photos or just websites when browsing.
6233638, colabora en el desarrollo de madVR:
Doom9's Forum - View Single Post - madVR - high quality video renderer (GPU assisted)If your display supports 0-255, then setup is easy - set everything to 0-255 and you don't have to think about it.
If your display does not support 0-255, you probably should not output 0-255 from the video card (using madNvLevelsTweaker.exe) and will have to compromise.
The first option is to have everything set to 0-255, except for the video card output, so that on the output stage it is being converted to 16-235. This means that all content is kept at the same levels (desktop & video) but the conversion to 16-235 on output may introduce banding. If you are using your PC for more than just video playback, this is the setup you have to use.
However, if you are going to be using the computer exclusively for watching videos through madVR, you have a second option. What you can do is set the video card output to 0-255, and set madVR to 16-235.
This will avoid the potential banding from having the video card compress the output levels to 16-235. But it will make anything that is not video look terrible, as anything on the desktop will still be outputting 0-255, and all values above 235 and below 16 will be clipped. (very high contrast image with no shadow/highlight detail)
I would only suggest doing this if your are only using the PC for video playback, and are seeing banding from the video card outputting 16-235.
Con esa configuración el renderer convierte el rango visible de la peli a 0-255 y diferencia en cuanto a negro y blanco no debería haber. Pero esta conversión produce floating point que o bien redondeas y lo dejas así, y acaba la imagen con banding visible, o bien añades dithering si usas un buen renderer de vídeo y disimulas este banding (hay mas conversiones en la imagen a parte de esta así que al final el dithering es necesario y por eso no importa tanto esta conversión de niveles).
Exacto, haces clipping de los BTB y WTW. Como la norma creo que dice que ahí no debería haber información visible entonces no afectaría hacer este clipping. Pero hay gente que prefiere dejar pasar algo de WTW y huye de este clipping, por ejemplo:
AVS HD 709 - Blu-ray & MP4 Calibration - Page 128Blu-Ray has 8-bit color depth and it's using signal in TV Legal (Video Range) (16-235) for bluray movies content.
Levels 0 and 255 are not used in image transmission... they used for other reasons.
So the image is 1-254, from these levels 1-16 are not used (are black) because 16 is the reference black. For the 235-254 you can have image information about these levels encoded but they are not used either in movie content.
Blu-Ray Mastering / post production studios are working the bluray content to 16-235, they have RGB Histograms, vectorscopes, out of range indicators, autolimiters, so they have real-time checking/controling for the content to be inside 16-235 range
....but during the mastering, the use RGB Space, then it's converted to YCC 4:2:0 for the bluray disk and when you playback the movie the player is converting the signal from YCC 4:2:0 -> YCC 4:2:2 or YCC 4:4:4 or RGB-Video and when it enters to your display its converted again until it re-converted at the final stage to RGB to go to the panel.
So after all these conversion, add the rounding errors, add player inaccurancies, add player problems to conversions..... maybe the 235 will go to 236 or 237 or 238.
I have a lot of reference calibration disks that have videos with 16-254 levels but these are only for testing/demonstrations, actual bluray movies they are not using 240-254 levels....
But if you like you can set your Contrast to view flashing bars up to 253 (254 is the background) but the only thing you will miss is your total peak output.... but you need a meter to set your peak output also
...A real calibration requires meter/software/knownledge, all the pattern disks are for preparing the display before using real meters, they don't calibrate your display.
Por eso hay gente que prefiere para películas la configuración gráfica sacando RGB completo, renderer de video en 16-235 y TV en limitado (no alteras el rango de las pelis y se conservan los WTW lo que permite personalizar el clipping en un valor mas allá de 235).
Como siempre se dice, al final eres tu quien va a ver la peli en tu configuración software/hardware particular (cada TV es un mundo) y lo suyo es que esté a tu gusto. Utiliza los patrones que quieras para ajustar la TV, proyector, monitor, etc. y comprueba como se comportan para dejarlos a tu gusto que al final es lo que importa.
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