Originally Posted by music_to_my_ear
I know the ZT60 is capable of approx 30,000 shades of black. Could this feature enable the shades of gradations? THe higher the settings the more gradations?
Hi, this is a huge marketing failure, Black has no Shades, it's Black, Reference Black has RGB Triplet 16.16.16 in 8bit Video Range signal.
As we know Blu-Ray has 8-bit color depth and it's using signal in TV Legal (Video Range) (16-235) for bluray movies content.
Levels 0 and 255 are not used in image transmission... they used for other reasons.
So the image is 1-254, from these levels 1-15 are not used (are below black) and 16 is the reference black. For the 235-254 you can have image
information about these levels encoded but they are not used either in movie content.
Blu-Ray Mastering / post production studios working the bluray content to 16-235, they have RGB Histograms, vectorscopes, out of range indicators, autolimiters, so they have real-time checking/controling for the content to be inside 16-235 range....but during the mastering, the use RGB Space, later after the color correction work to rec.709 the contect it's converted to YCC 4:2:0 for the bluray disk and when you playback the movie the player is converting the signal from YCC 4:2:0 -> YCC 4:2:2 or YCC 4:4:4 or RGB-Video and when it enters to your display its converted again until it re-converted at the final stage to RGB to go to the panel.
So after all these conversion, add the rounding errors, add player inaccurancies, add player problems to conversions..... maybe the 235 will go to 236 or 237 or 238.
So lets say that you have data encoded using 16-235 levels, this means you have 220 grayscale shades from 0% Black -100% White in 8-bit signal., 880 shades in 10bit signal, 3520 shades in 12bit signal, 14080 shades in 14bit signal, 56320 shades in 16bit signal.....but all these are grayscale shades available for the full 0-100%. (and content of commercial movie at 10/12/14-bit depth doesn't exist in any consumer format)
We can say that the Shadow detail exist between of about 0-5% Gray so this means that it's from 16 till 27 which is 12 shades..... if you calculate all the possible R+G+B Color Channel combinations that can be available to a 8-bit signal you get 1728 possible colors (not shades)....
For example if you want to check if your display can reproduce these shades of gray (254 levels)....load a Grayscale Ramp Pattern like the one below, and check if you can identify any of the 254 different gray bars of that ramp....if you can't identify any bar then your display can reproduce 254 different steps....if it's not smooth...that means is that you can't see 254 and can only reproduce less steps.
So no panel can't reproduce these 30.000 shades....