Iniciado por
J_Locke
King, como lector de AVSFORUM que eres, cuando veas el RS2000 danos tu feedback del fallo que están reportando estos días a JVC con el iris dinámico (hace que los blancos sobre fondos negros se quemen o "amarilleen"). Kris Deering, analista de Sound & Visión se lo ha reportado directamente a JVC hace unos días y se están recopilando ajustes donde es visible el fallo para que JVC puede reproducirlo y arreglarlo.
Por otro lado también dicen desde JVC Alemania que se retrasa la entrega de unidades a abril, lo que supone ya un retraso de 5 meses. No sé que unidad se espera en nuestro país para marzo, quizás los "primeros espadas" de JVC del foro puedan darnos más información.
FUENTE AVSFORUM 06/03/2019
"Regarding the DI issue, here are my observations at this stage:
- The blooming and yellowing of white objects on black backgrounds (Lucy opening credit at 00:01:30) is a new bug. I haven't seen it on the rs500 or earlier models. It's visible on static situations, for example on a PC desktop with a black background, with just the taskbar visible. The icons are washed out and yellowed.
- The blooming and yellowing on fade ins is connected to this issue. I think it is made worse by the fact that the fact that the DI is slower to close and open than the previous implementation in older models. This means that there are more chances to see such artifacts on a fade in after a yellowed text on credit, because it takes longer for the iris to open. I haven't timed it but I would say that the iris is about two times slower in the new implementation on the new models. It can be seen in Mad Max though, on Furiosa's neck on the fade in just after the Fury Road title after the opening sequence. This isn't after a white credit text, yet the yellowing can be clearly seen.
- I can't find any connection between this artifact and the black levels or the JVC tonemapping settings. I have the issue with Lucy with the HTPC doing the tonemapping, and no issue with the UB900 or the HTPC sending HDR to the JVC, yet the iris closes down just as much and the black levels are the same. Making the picture really dark by setting the auto tonemapping slider on the JVC to -5 and/or lowering brightness to -7 or more doesn't make any difference. I simply can't trigger it.
- I can't really see a specific source or setting that triggers it. It looks like it happens more often when using a source that does the tonemapping and sends SDR WCG to the JVC, but the XBOX doesn't and still have the issue. I haven't seen a report from a user of a UHD Bluray player that sees the issue and also provides all the requested information, so that we can assess if it's a user settings issue or if the issue does actually happen in a properly configured setup. I can only report that here, with a UB900 properly configured or with the HTCP configured to send HDR Passthrough with the JVC using an HDR calibration, I can't reproduce the issue.
- The other iris artifact, which doesn't involve yellowing but clips highlights and causes blooming of small bright objects on dark backgrounds (the MI:Fall Out car headlights example from 00:05:57, sub lights in the underwater opening sequence of The Meg) is an old issue that is still present. It is made worse when the source does the tonemapping, but it's still there even when sending HDR to the JVC.
- Both issues are most visible with the manual iris fully open. All my tests were done using manual iris open and auto 2. Setting the manual iris to -7 lowers the amount of artifacts considerably. Setting the manual iris to -10 or less and the artifacts go away almost entirely (and so does the benefits of the DI, as there is no DI position that closes further than the most closed manual position, as was the case in the previous implementation on older models).
- It would be great if JVC could resolve both issues
- Failing this, and in fact even if this was resolved, please could we have an auto 3 setting (or one of the existing DI modes) to do zero gamma manipulation, NONE AT ALL, and only kick in on fade to black, with a DI closing much further down and faster, ideally at least as close and as fast as in the earlier DI implementation? If this causes issues on end credits, as the earlier implementation did, it doesn't matter, but at least we would have a better fade to black and a much higher dynamic contrast.
@Kris Deering , please can you confirm that you can reproduce both issues above and can show them to JVC if necessary?
@Mike Garrett , please could you confirm that the above is passed on to JVC and let us know if they can reproduce both issues?"