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.


366 posts

Ultimate Geek
+1 received by user: 3


Topic # 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
608 posts

Ultimate Geek
+1 received by user: 31


  Reply # 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



366 posts

Ultimate Geek
+1 received by user: 3


  Reply # 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 »

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 »

IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12


New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17


Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41


Exhibition to showcase digital artwork from across the globe
Posted 23-May-2018 16:44


Auckland tops list of most vulnerable cities in a zombie apocalypse
Posted 23-May-2018 12:52


ASB first bank in New Zealand to step out with Garmin Pay
Posted 23-May-2018 00:10


Umbrellar becomes Microsoft Cloud Solution Provider
Posted 22-May-2018 15:43


Three New Zealand projects shortlisted in IDC Asia Pacific Smart Cities Awards
Posted 22-May-2018 15:14


UpStarters - the New Zealand tech and innovation story
Posted 21-May-2018 09:55


Lightbox updates platform with new streaming options
Posted 17-May-2018 13:09


Norton Core router launches with high-performance, IoT security in New Zealand
Posted 16-May-2018 02:00


D-Link ANZ launches new 4G LTE Dual SIM M2M VPN Router
Posted 15-May-2018 19:30


New Panasonic LUMIX FT7 ideal for outdoor: waterproof, dustproof
Posted 15-May-2018 19:17


Ryanair Goes All-In on AWS
Posted 15-May-2018 19:14


Te Papa and EQC Minecraft Mod shakes up earthquake education
Posted 15-May-2018 19:12



Geekzone Live »

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



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.