| Author |
Message |
CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
|
| Posted: Fri Apr 12, 2013 4:12 pm Post subject: |
|
|
With YCbCr the luma range is always 16-236.
With RGB the luma range can either be 16-236 or it may be 0-255. Furthermore, the luma range with RGB will not be specified by devices because that data is not contained in the info frame. So the source and display cannot communicate this data between each other.
You must set the Oppo to 16-236, the input on the Lumagen must be set to 16-236, and the output of the Lumagen must be set to 16-236. Also, your display must know to use (be set to) 16-236.
If you have any of those wrong than you will have incorrect brightness and contrast. If you set the Oppo to YCbCr than the output of the Oppo will be correct automatically because YCbCr only supports 16-236. In this case the input to the Lumagen will also automatically be correctly set to 16-236 because again, YCbCr only supports 16-236. If you then want to use RGB from the output of the Lumagen to the input of the display than you must set the Lumagen to RGB "video" level with is 16-236. You must also set your display (or it must support it by default) to 16-236.
RGB in video is supposed to only use 16-236. However, computers are supposed to use 0-255. What happened is that many video devices incorrectly use 0-255 and that created issues as soon as the DVI standard emerged that we are still dealing with today.
You should really use YCbCr 422 between the Oppo and Lumagen because this is 12-bit color data and will provide the best possible image quality with the least interpolation by the BD player.
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying 
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
|
|
| Back to top |
|
 |
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Fri Apr 12, 2013 7:08 pm Post subject: |
|
|
Well it is working now. One problem solved  . Thanks a lot !
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Fri Apr 12, 2013 7:49 pm Post subject: |
|
|
| Nashou66 wrote: | | Corleone88 wrote: | | Well it is working now. One problem solved . Thanks a lot ! |
Cool!!
I still don't like the way the radiance works the Timing numbers.
Athanasios |
I still have problems with timings. Yc422 issue is resolved now.
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Wed Apr 17, 2013 9:48 pm Post subject: |
|
|
I am going crazy with this brightness problem because after setting everything to Yc422, I have the same kind of issue when adding my HDQ.
OPPO->XD->BG808 all set to Yc422 => OK
OPPO->XD->HDQ->BG808 all set to Yc422 => brightness too high
I reset my HDQ with factory values. Same result: brightness is too high.
|
|
| Back to top |
|
|
|
|
