7800gt 发表于 2011-6-21 15:52
接电视看片有丢么
| Response (Ray) | 05/09/2011 11:57 AM |
| Hi Edison, The case was escalated to me. The next step will be to escalate this to our quality lab and see if they can replicate the failure. But judging from the data this doesn't appear to be something that our lab can easily replicate. I can submit the data you provided and see if they can extract anything from there. I did discuss your case with other agents and they suggest checking to make sure your desktop resolution is set to a PC mode and not a SD, HD mode. According to engineering full color range is only available when desktop is set to a PC resolution. If you go into the NVIDIA Control Panel > Change Resolution, you should see a list of resolutions. The first section will be "SD, HD" but if you scroll down you should see a "PC" list of resolutions as well. Most HDTV have separate mode table for PC. If PC resolutions is available try setting to one of the PC modes and see if that helps. Although I would expect the result to be the same for both 260.99 and 270.61 but according to your data it appears the 270.61 quality is worst then the 260.99? If yes then that would point to a possible driver issue, but may not be the same full range color issue with SD, HD resolution. Best Regards, NVIDIA Customer Care | |
| Response (Ray) | 05/10/2011 01:14 PM |
| We escalated the bug to one of our engineers and he believe the driver is using Limited Range and not Full Range due to the 1920x1080x60Hz/P mode . Per HDMI spec 1.4a chapter 6.6 "Video Quantization Ranges" at page 116: "Black and white levels for video components shall be either "Full Range" or "Limited Range." Limited Range shall be used for all video formats defined in CEA-861-D, with the exception of VGA (640x480) format, which requires Full Range." He believes in your case, the problem was in 1920x1080x60Hz/P which is one of CEA-861-D defined spec. That's why we use "Limited Range" by default. In order use "Full Range" by default you may add a regkey "SetDefaultFullRGBRangeOnHDMI"(dword)=1 as the workaround. The correct RGB limited range is 16-235 in RGB/8bpc mode or 256-3760 in RGB/12bpc (deep color) mode. Can you use the attached "DispRegEdit.exe" tool and add the "SetDefaultFullRGBRangeOnHDMI" registry key and see if that helps. The tool should take you to the area in the registry to add this key. Add the key and then restart Windows and check again. The engineer would like to know if you're using a HDMI monitor that support deep color and how the range limit was measured as 32-219. But he like you to try the registry key to confirm. | |
| Response (Ray) | 05/12/2011 11:04 AM |
| Thanks for the update. The bug has been escalated to engineering and they're investigating. They did request for monitor EDID and how the range limit was measured as 32-219? Can you provide that information? Here are steps below to extract the monitor EDID data so our engineering team can review. To get the EDID, please do the following: 1) Download the program here: http://www.entechtaiwan.com/util/moninfo.shtm 2) Install and run the program 3) Click on File->Safe As 4) Safe it as a *.Bin file and attach it to your case. -Ray | |
| Response (Ray) | 06/03/2011 03:49 PM |
| Hi Edison, I just received any update from engineer who is investigating the issue. With latest 275.33 driver and the same GeForce GTS 450 in HDMI limited range RGB/8bpc mode, our engineer measured the dynamic range as 16-234 which is 1 off from the HDMI spec (16-235). But it's still a lot better than the you're reporting which is (32-219). Can you provide more detail on how you are measuring the pixel values? In our lab, we have a tool to output a gray scale from 0~255 and we used the Astro analyzer to measure the pixel data from the HDMI output. Could be the way we are measuring the pixel value. If we can better understand how you measure then the lab can hopefully duplicate and re-analyze the data. -Ray | |
| Response (Ray) | 06/08/2011 01:04 PM |
| Thanks for the update. Since DSLR was involved in the methodology, there are more factors involved such as if the panel truthfully represent the received pixel data and if the DSLR does not introduce any extra artifacts. But overall our methodology which takes the pixel data directly from the HDMI port by an analyzer is much more reliable. We used your test image (gray_0-255.png) and measured [16-234] from the analyzer in RGB mode, which is expected level. The engineer believes this could be related to the specific HDMI monitor and how well it represents the color from the received pixel data. Other display setup like dithering could also contribute to the final result. But there is no way for us to verify for sure without this particular monitor in house to verify. Now you had indicated that when using the 260.99 you don't see the same quality issue? What was the 260.99 range measured? Was this using the same DSLR methodology to measure the range? If yes than that would suggest a change in the driver if all variables same but the driver version. Our internal measurement using an analyzer directly to the HDMI port did not yield any quality concerns, in fact based on measurement all is as expected range at [16-234]. So in the end we may have to get this HDMI TV in house and apply some experiment on it to find out what may improve the display quality on this panel. But overlay there is no wrong-doings so far on the graphics driver side from what he can measured. Can you give me the brand and exact model of this monitor so we can check if we have this particular model in any of our labs? | |
| Response (Ray) | 06/17/2011 10:15 AM |
| Hi Edison, Our engineering team did more measurement and confirm that the output range is within specification. We are measuring directly from the HDMI output and all data suggest normal and expected RGB color range. They suspect the final display on the HDMI TV is enhanced by the TV internal video filter which is likely responsible for the loss of the RGB color range. Unfortunately we don't have this TV so we are unable to confirm 100%. As far as they can tell there is no quality issue based on directly HDMI output measurement. -Ray | |
7800gt 发表于 2011-6-21 15:52
接电视看片有丢么
erhang 发表于 2012-6-1 00:46
又测试了一下ＮＶ的ＨＤＭＩ效果，发现新驱动改善了，不再像以前我拍照片的那样黑白渐变愣子严重了，感觉跟 ...
那就是修复咯 erhang 发表于 2012-6-1 00:46
又测试了一下ＮＶ的ＨＤＭＩ效果，发现新驱动改善了，不再像以前我拍照片的那样黑白渐变愣子严重了，感觉跟 ...
Edison 发表于 2012-6-1 01:43
建议用旧驱动对比一下，这样才好确认。
火云喷神 发表于 2012-6-1 07:58
本区不是说n卡高清全面超越amd，笑了
接高清电视只有独立a卡，集成都不行。测试总是测试，intel，nv差尿了 ...
erhang 发表于 2012-6-1 09:07
NVIDIA/ati，视频有一点区别，但是不截图放大比较，很难察觉。
谈不上谁更好。
要想画质变好，得买个好 ...
Viperknight 发表于 2011-10-24 12:36
抓住问题核心就可以了，这个问题NV研究以后未能解决，也就是n卡的HDMI输出是可能丢失色阶，如果你用N卡，就 ...
无限の万花镜 发表于 2012-7-14 19:07
NV修复个屁 hdmi照样色阶丢的连他妈都认不出来了 玩侠盗看个跑车的截图 nv hdmi效果惨不忍睹
zhangrr70 发表于 2012-7-15 11:54
NV向来对国内这些未通过HDMI认证的TV不予支持，像N年前我遇到过的长虹HDMI连NV显卡会被认成DVI模式无声音 ...
erhang 发表于 2013-10-28 21:14
我这两年都是PC安装苹果系统了，n，a几乎没什么区别，相似度99％。
总归，区别还是win的不同驱动造成的差 ...
，看电视HDMI不如几年前的HD4850,电视是松下的bhl 发表于 2013-10-28 21:38
我正在用GTX680-DC2，用大屏幕电视还是有问题，看电视HDMI不如几年前的HD4850,电视是松下的 ...
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