Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




392 posts

Ultimate Geek


# 24343 21-Jul-2008 22:23
Send private message

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.


Create new topic
635 posts

Ultimate Geek


  # 150309 22-Jul-2008 14:51
Send private message

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



392 posts

Ultimate Geek


  # 150594 23-Jul-2008 11:33
Send private message

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.


Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Vodafone integrates eSIM into device and wearable roadmap
Posted 17-Jan-2020 09:45


Do you need this camera app? Group investigates privacy implications
Posted 16-Jan-2020 03:30


JBL launches headphones range designed for gaming
Posted 13-Jan-2020 09:59


Withings introduces ScanWatch wearable combining ECG and sleep apnea detection
Posted 9-Jan-2020 18:34


NZ Police releases public app
Posted 8-Jan-2020 11:43


Suunto 7 combine sports and smart features on new smartwatch generation
Posted 7-Jan-2020 16:06


Intel brings innovation with technology spanning the cloud, network, edge and PC
Posted 7-Jan-2020 15:54


AMD announces high performance desktop and ultrathin laptop processors
Posted 7-Jan-2020 15:42


AMD unveils four new desktop and mobile GPUs including AMD Radeon RX 5600
Posted 7-Jan-2020 15:32


Consolidation in video streaming market with Spark selling Lightbox to Sky
Posted 19-Dec-2019 09:09


Intel introduces cryogenic control chip to enable quantum computers
Posted 10-Dec-2019 21:32


Vodafone 5G service live in four cities
Posted 10-Dec-2019 08:30


Samsung Galaxy Fold now available in New Zealand
Posted 6-Dec-2019 00:01


NZ company oDocs awarded US$ 100,000 Dubai World Expo grant
Posted 5-Dec-2019 16:00


New Zealand Rugby Selects AWS-Powered Analytics for Deeper Game Insights
Posted 5-Dec-2019 11:33



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.