video card lut depth....
video card lut depth....
- Subject: video card lut depth....
- From: tom lianza <email@hidden>
- Date: Mon, 02 Jun 2008 21:55:19 -0400
Hi to all,
For digital displays, DVI dual link, HDMI dual link and Display Port
Dual link can all send multi-byte digital data to a display. The
problem is there a few displays that can actually accept 10 bit data.
I'm currently working on an LCD display which does have this capability
(but will remain unnamed until it's formal introduction) . I also
worked on the afore mentioned Super Mac (or was it Radius by then?)
thunder card which had 10 bit DACS . The problem with 10 bit Dacs
really didn't have anything to do with measuring the output. The
problem was the display environment couldn't support 10 bit resolution
on input because of noise and bandwidth restrictions. It was very
difficult to show a convincing difference between 10 bit and 8 bit
operation with a display set to gamma 2.2. If you were running at a 1.8
gamma, you could see real improvement in shadow quantization, but you
had look really hard. It was not an easy sell to management and it was
an even harder sell to the end user who had to pay for it.
The display that is currently underdevelopment has a panel capable of
accepting 10 bit data and has a numerical data path that supports true
12 bit operations. The problem in finding a card that can actually
drive these displays at 10 bits is still tricky. I think that we will
see the cards catch up by the end of the year as HDMI and Display Port
become more common on PC displays. The LUT in the graphic card will no
longer be necessary as more advanced displays hit the market. As a
matter of fact, this new generation of displays has optical
stablization, and some very sophisticated hardware to adjust to specific
color spaces. It should be an interesting second half of the year.
The fact is that the processor in most high resolution, high bandwidth
displays is far more powerful the processor in the desktop machine. The
graphics card is simply becoming a dumb highspeed converter in video
applications. Naturally, this is not true for graphic operations
utilizing Direct X or Open GL. In my opinion, the biggest roadblock in
the video chain will be getting HDMI and DisplayPort supported by the
video cards and drivers.
Regards,
Tom
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