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391 posts

Ultimate Geek


# 24343 21-Jul-2008 22:23
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I had huge problems with some sort of "dynamic contrast" effect, see the whole story here: http://www.geekzone.co.nz/forums.asp?ForumId=84&TopicId=23498

I was pointed towards the video levels being the cause, and digging deeper I found the new release of 177.66 driver for nVidia:

This allows you in the Control Panel to switch between 0-255 (PC levels) and 16-235 (video levels) modes. After updating the driver the picture got more contrast and the random contrast change nearly dissapeared. I say "nearly" due to some odd re-occurences. But overall, I can say is nearly gone. Just installed it 2 hours ago. The black pillars (on a 4:3 picture) used to be badly pixelated, now they are not, and it also appears the colour gradient display improved a bit (smoother transition from one shade to another, I used to get lots of concentric circles... you know what I mean).

So far, the only downside I noticed is some "low frame" effect on TV3 only, even if the cpu load is the same as before (45-50% on TV3... I know... I do not have HA... I did not manage to get it working...). I hope some future playing with the codecs and some tweaking will sort it out, I had this happening before. Maybe it is not even related with the driver update...


Hopefully other users out there are looking for an easy way to get the video levels changed.
Please post your feedback regarding the new driver.

NOTE: after installation, it was set to 16-235 by default, I had to change it to 0-255.




mobo Intel DH55PJ, RAM: 4GB RAM, Nova-T 500 HD + Avermedia Trinity tuner card, Geforce 520 video, 120GB SSD Sandisk + 640 WD + 1000SG, Win7 Home Prem 64-bit, Media Portal 1.15.0; BTC 9019URF Cordless Keyboard, Panasonic 55" (HDMI cable), HTPC Case Silverstone Grandia GD05B.


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635 posts

Ultimate Geek


  # 150309 22-Jul-2008 14:51
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NOTE: after installation, it was set to 16-235 by default, I had to change it to 0-255.


I though 16-235 was a better option for TV's. Something to do with black levels as mentioned here.
http://www.audioholics.com/tweaks/calibrate-your-system/hdmi-black-levels-xvycc-rgb

Cheers
DB



391 posts

Ultimate Geek


  # 150594 23-Jul-2008 11:33
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Honestly, I do not master all the details regarding the video levels issue, but switching to 0/255 helped me to get rid of 95% of the contrast changes I used to encounter. Maybe the crt tv expects 16/235, but the digital displays (LCD, plasma) expect 0/255? When I investigated what is happening and I connected a CRT tv to the pc, it did not show the random contrast change. It was showing up only on the 46" Bravia LCD...

Still does it, now and then, but the contrast change is definetely more gentle, not so visible / annoying. Maybe there is a "dynamic contrast" feature built-in on the graphic card as well... which is still active (the same tv feature is turned off).

The bottom line: all is much better than before using this driver.




mobo Intel DH55PJ, RAM: 4GB RAM, Nova-T 500 HD + Avermedia Trinity tuner card, Geforce 520 video, 120GB SSD Sandisk + 640 WD + 1000SG, Win7 Home Prem 64-bit, Media Portal 1.15.0; BTC 9019URF Cordless Keyboard, Panasonic 55" (HDMI cable), HTPC Case Silverstone Grandia GD05B.


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