Originally Posted by Scott Wilkinson
As Stacey Spears has pointed out to me, there is no way to definitively measure the native bit depth of a display panel without physically dismantling the TV and testing the panel directly, which is clearly impractical. So I'm afraid those who believe that the tests mentioned in this article can provide this information are mistaken. Instead, these tests measure the performance of the system as a whole.
An HDR display with an 8-bit panel and good dithering algorithms can certainly display HDR content in a way that looks better than the best SDR presentation. But I would prefer a panel with a native bit depth of at least 10 bits, along with a signal path that maintains 10-bit precision from one end to the other. I wish there was a foolproof way for consumers to determine this for all displays, but in some cases, there isn't.
Still, the bottom line is how it looks displaying real program material. If you like what you see, there's no need to stress about the panel's bit depth—just sit back and enjoy!
Many thanks to Stacey Spears and Tyler Pruitt of SpectraCal for their generous help with this article.
Note: Please do not quote this entire article when posting a comment. Feel free to quote the relevant portion that pertains to your comment, but wading through the entire thing in the comments is quite annoying. Thanks!
How to know if the panel to our TV is a true 10-bit color?
Forget about all those software "gyms" that you have chosen in your article.
For this, you need an DSLR camera and the necessary lens for shooting in macro mode.
Drop white screen from PC to TV. This will make you light up all domains in pixels. Then count subpixel domains in the picture.
To seek several images to compare from Internet.
Panasonic TX-58DX900E : Test complet
Here we see 12 domain (small squares in subpixels) which means that the matrix is 12 bit.
12 bit color - 2 at the 12 degree or 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 - gives us 4096 shades of color.
10 bit color - 2 at the 10th degree or 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 gives us 1024 tint.
Now let's look at a matrix of last year's model Panasonic TX-55CX800E
Panasonic TX-55CX800E : Test complet
Here we see 8 domain subpixel, it means that the matrix is 8-bit.
8 bit color - 2 of eighth grade or 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 gives us 256 shades.
The standard 8-bit panels normally used for LCD TVs are able to provide 256 degrees of gradation between colors ... which is too small to display the surrounding reality where the colors are 48 bit. The low bits the panel leads to the effect color banding
The color depth is the number of bits used to represent the brightness of a color component (red, green or blue). The current standard is 8 bits, which represents 256 brightness measurements for each color component. The final color of a pixel is a mixture of red, green and blue; a pixel is encoded in 24 bits.
The Rec.2020 defines encoding of a color component, also known as color depth, 10 bits or 12 bits. Color area Rec.2020 returns to encode a pixel of 30 bits (3x10 bit) or 36 bit (3x12 bit) for data describing its luminance and therefore its colorimetry. The color depth of 8 bits is finally abandoned by Rec.2020 color space enabling smooth color gradients and avoid the phenomenon known as Banding.
Color depth, that is the number of bits used to represent the brightness of the color components (red, green or blue). The current standard is 8 bits representing 256 steps of brightness for each color component. The final color of the pixel is a mixture of red, green and blue; pixel is encoded in 24 bits (3 sub-pixels x 8 bits = 24 bits).
8 bits per channel RGB = 24 bits total = 256 x 256 x 256 (shades of blue, red and green) = 16.7 million colors
10 bits per channel RGB = 30 bits total = 1024 x 1024 x 1024 (shades of blue, red and green) = 1.07 billion colors
12 bits per channel RGB = 36 bits total = 4096 x 4096 x 4096 (shades of blue, red and green) = 68.71 billion colors
14 bit per channel RGB = 42 bits total = 16394 x 16394 x 16394 (shades of blue, red and green) = 4 406 104 490 984 colors
16 bits per channel RGB = 48 bits total = 65 576 x 65 576 x 65 576 shades of blue, red and green = 281 990 684 422 976 colors
In the 8 bit video panels use a few tricks to play 10 bit color.
Dithering - this is the rendering of two shades to reproduce intermediate shades.
Make a matrix in order to reproduce the precise shade, as there is in the incoming video signal, but can not replicate in normal mode of 8-bit matrix.
FRC - Frame Rate Control
1.Display Color : 16.7 million colors (8-bit)
2.Display Color : 1.06 billion colors (8-bit + Dithering)
3.Display Colors : 1.07 billion colors (10-bit)
For videos (films, concerts, documentaries) stored on optical physical media (Ultra HD Blu-ray):
The specifications of the Blu-ray ultra broadcast in January 2015 indicate two color depth allowed:
• 8 bits if encoding stroke,
• 10-bit encoding if HEVC.
For broadcast TV (ie Broadcasting via satellite or TNT, broadbanding ie via internet or via live website housing):
The DVB consortium, which specifies parameters such exploitable UHD television signals in Europe (UHD UHD-1 and-2), set in January 2014 to a depth of 10bits single color for the introductory phase of the UHD -1. The 8-bit is left permanently for future UHDTV channels broadcast in Europe. Negotiations are underway for the UHD-1 (2nd phase which should be released in 2017) can also be distributed in 12 bits. This abandonment of the 8 bits can anticipate the arrival of another expected feature of UHDTV namely the High Dynamic Range (HDR). HDR works with a result of degraded video signals whose primaries are encoded in 8 bits where the formalization of minimum 10 bits.
For videos (films, concerts, documentaries) available via streaming or video sites on demand:
Due to the problems related to the low internet bandwidth available in the majority of consumers, coding 8 bits long remain the reference display format on the net.
In this post I made a few tables specifically for you and everyone else.
Attention! The information in the tables is for European models.
The human eye differs contrast (naturally) no more than 40,000: 1 and 2.3 million colors. And resolution is 576,000,000,000 pixels.
Sensitivity is 0.000001 cd/m2 - that is, at night you can see a burning candle from several kilometers away.