Eνα άρθο που πρέπει να διαβαστεί προσεκτικά για να βγουν συμπεράσματα.
Ισως ο ΜΑΣΤΟΡΑΣ, όπως έχω καταλάβει ότι είναι ο τίτλος, να μπορεί να πεί τα συμπεράσματά του σαν ειδικός.
Παραθέτω αποσπάσματα και το link.
xvYCC - a Marketing Gimmick? Mostly.
With xvYCC, the range is again extended to 0-255 as is expected, since digital TVs have no under- or over-shoot as did analogue television signals. This will effectively override (in theory) any RGB or YCbCr settings on your source, AV receiver, or display. The idea is that the xvYCC color gamut is only effective when all components in a chain support it. While several AV receivers and displays support xvYCC color space, currently only the PlayStation3 provides xvYCC as a source. Here's where it gets dicey: The Blu-ray specification for movies (BD-ROM) does not support Deep Color or the new xvYCC color space. Oops.
I'll say it again: Blu-ray and HD DVD movie formats are limited to 8-bit 4:2:0 YCbCr. To our knowledge, there is no move to add xvYCC expanded color capability to the BD-ROM specification. In addition, issues of backwards compatibility would be extremely difficult to overcome, rendering any new 10-bit or higher formats unplayable on legacy BD players. The only solution would be to take advantage of larger BD storage media and issue discs with dual data streams for video (double sided or dual layer if you will).
Manufacturers are not Speaking the Same Language Unfortunately, manufacturers are coming up with their own ways of dealing with interoperability issues with respect to levels and color range issues. A good example is Epson's new Pro Cinema 1080UB projector. On standard factory settings the Epson does not allow below black (blacker-than-black) pluge calibration. To get the levels right on this model, you need to enable "Expanded" mode on the HDMI Signal Range setting. Epson isn't the only display that requires this odd setting, Marantz' new VP-15S1 exhibited the same behavior.
Simplifying the Process - What to Do
Luckily for us - the net result is that these settings aren't all that hard to get right after all. Here are a few things to keep in mind, however:
First, set your source components to output YCbCr if there is an option. Second, get a test disc that has a Blacker-than-Black pattern (AVIA Pro, Digital Video Essentials, any THX DVD with THX Optimizer, etc) and ensure that you can see blacker-than-black on your display. Third, switch your display's HDMI setting from 'Normal' to 'Enhanced' if you do not see the Blacker-than-Black pattern. As long as you can see a below black signal, you are more than likely set up to get the best possible dynamic range from your display. Your final step in resolving this issue should be to set the correct black and white levels.
http://www.audioholics.com/tweaks/calibrate-your-system/hdmi-black-levels-xvycc-rgb
Ισως ο ΜΑΣΤΟΡΑΣ, όπως έχω καταλάβει ότι είναι ο τίτλος, να μπορεί να πεί τα συμπεράσματά του σαν ειδικός.
Παραθέτω αποσπάσματα και το link.
xvYCC - a Marketing Gimmick? Mostly.
With xvYCC, the range is again extended to 0-255 as is expected, since digital TVs have no under- or over-shoot as did analogue television signals. This will effectively override (in theory) any RGB or YCbCr settings on your source, AV receiver, or display. The idea is that the xvYCC color gamut is only effective when all components in a chain support it. While several AV receivers and displays support xvYCC color space, currently only the PlayStation3 provides xvYCC as a source. Here's where it gets dicey: The Blu-ray specification for movies (BD-ROM) does not support Deep Color or the new xvYCC color space. Oops.
I'll say it again: Blu-ray and HD DVD movie formats are limited to 8-bit 4:2:0 YCbCr. To our knowledge, there is no move to add xvYCC expanded color capability to the BD-ROM specification. In addition, issues of backwards compatibility would be extremely difficult to overcome, rendering any new 10-bit or higher formats unplayable on legacy BD players. The only solution would be to take advantage of larger BD storage media and issue discs with dual data streams for video (double sided or dual layer if you will).
Manufacturers are not Speaking the Same Language Unfortunately, manufacturers are coming up with their own ways of dealing with interoperability issues with respect to levels and color range issues. A good example is Epson's new Pro Cinema 1080UB projector. On standard factory settings the Epson does not allow below black (blacker-than-black) pluge calibration. To get the levels right on this model, you need to enable "Expanded" mode on the HDMI Signal Range setting. Epson isn't the only display that requires this odd setting, Marantz' new VP-15S1 exhibited the same behavior.
Simplifying the Process - What to Do
Luckily for us - the net result is that these settings aren't all that hard to get right after all. Here are a few things to keep in mind, however:
- Standard definition DVDs, Blu-ray discs and HD signals are all YCbCr 16-235 range native. Always set your source to YCbCr mode (not RGB) when calibrating your black and white levels on your display.
- Some AV receivers may not pass anything except 16-235 via HDMI. This means that if you are setting your source to RGB (0-255) you may get your black and white levels truncated.
- xvYCC is significant ONLY if all components in the chain support xvYCC. Do not utilize this setting on any component unless everything else can fall into place. Once set, xvYCC should override and RGB or YCbCr settings.
First, set your source components to output YCbCr if there is an option. Second, get a test disc that has a Blacker-than-Black pattern (AVIA Pro, Digital Video Essentials, any THX DVD with THX Optimizer, etc) and ensure that you can see blacker-than-black on your display. Third, switch your display's HDMI setting from 'Normal' to 'Enhanced' if you do not see the Blacker-than-Black pattern. As long as you can see a below black signal, you are more than likely set up to get the best possible dynamic range from your display. Your final step in resolving this issue should be to set the correct black and white levels.
http://www.audioholics.com/tweaks/calibrate-your-system/hdmi-black-levels-xvycc-rgb
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