mfogarty5
02-25-07, 04:29 PM
I have read with great interest some of the threads in this forum as well as the calibration forum. I have also posted this thread over there, but wanted to get the input of all the VP owners. Specifically I found the debate below between the PC RGB colorspace and the studio RGB colorspace to be very interesting and confusing.
http://archive2.avsforum.com/avs-vb/showthread.php?s=&threadid=416292
Specifically it appears that there is disagreement as to whether black than black(BTB) and whiter than white(WTW) are the intent of the creator or the result of poor encoding.
In any event I don't want to rehash the debate, but I do have two questions about this colorspace conversion as it relates to my display.
I have a 1080p LCD that accepts 1:1 pixel mapping over the VGA input, but not the HDMI input(At least not yet. There is a rumored firmware upgrade). As a result I am looking at getting an external video processor to get better de-interlacing and scaling. It appears that the VGA input is expecting PC RGB(0-255) rather than Video RGB(16-235). I understand the argument that Video RGB should be maintained from source to display, but I have to questions about this as it relates to my LCD.
First, I have a 10-bit display and it is my understanding that HDMI 1.1 is only capable of passing an 8-bit signal and that HDMI 1.3 will be capable of passing a 10-bit signal. VGA, on the other hand is capable of passing a 10-bit signal. If the above statements are true, then since I have an HDMI 1.1 display I am limited to passing 8-bit color via HDMI, but could pass 10-bit over VGA.
Second, one of the weaknesses of LCDs is their contrast ratio. Wouldn't converting a DVD's YCbCr(16-235) signal to a PC RGB(0-255) increase the contrast of my LCD at the expense of clipping BTB and WTW information? I understand that one limitation of performing the 16-235 to 0-255 conversion is banding, but shouldn't the fact that I have a 10-bit display mitigate this issue?
If what I have said is true it seems that connecting my LCD via VGA(0-255) could be superior because doing so would increase the perceived contrast ratio of my LCD and enable 10-bit processing in the external video processor rather than the internal video processor. The only drawback would be clipping of BTB and WTW information.
Is what I have said true or am I totally off base?
http://archive2.avsforum.com/avs-vb/showthread.php?s=&threadid=416292
Specifically it appears that there is disagreement as to whether black than black(BTB) and whiter than white(WTW) are the intent of the creator or the result of poor encoding.
In any event I don't want to rehash the debate, but I do have two questions about this colorspace conversion as it relates to my display.
I have a 1080p LCD that accepts 1:1 pixel mapping over the VGA input, but not the HDMI input(At least not yet. There is a rumored firmware upgrade). As a result I am looking at getting an external video processor to get better de-interlacing and scaling. It appears that the VGA input is expecting PC RGB(0-255) rather than Video RGB(16-235). I understand the argument that Video RGB should be maintained from source to display, but I have to questions about this as it relates to my LCD.
First, I have a 10-bit display and it is my understanding that HDMI 1.1 is only capable of passing an 8-bit signal and that HDMI 1.3 will be capable of passing a 10-bit signal. VGA, on the other hand is capable of passing a 10-bit signal. If the above statements are true, then since I have an HDMI 1.1 display I am limited to passing 8-bit color via HDMI, but could pass 10-bit over VGA.
Second, one of the weaknesses of LCDs is their contrast ratio. Wouldn't converting a DVD's YCbCr(16-235) signal to a PC RGB(0-255) increase the contrast of my LCD at the expense of clipping BTB and WTW information? I understand that one limitation of performing the 16-235 to 0-255 conversion is banding, but shouldn't the fact that I have a 10-bit display mitigate this issue?
If what I have said is true it seems that connecting my LCD via VGA(0-255) could be superior because doing so would increase the perceived contrast ratio of my LCD and enable 10-bit processing in the external video processor rather than the internal video processor. The only drawback would be clipping of BTB and WTW information.
Is what I have said true or am I totally off base?