Game Development Reference
In-Depth Information
Fig. 2.7
Vertical
and
horizontal
locations of 4:2:0 luma and chroma samples in a picture
and vertical dimensions, and the Y matrix shall have an even number of lines and
samples, as shown in Fig.
2.7
. 4:2:2 and 4:4:4 formats are usually used for high-end
display devices or postproduction in the studio (Fig.
2.8
).
Fig. 2.8
Ve r t i c a l
and
horizontal
locations of 4:2:2 (
left
) and 4:4:4 (
right
) luma and chroma samples
in a picture
Besides the sampling rate, the sampling precision of each component of YUV
is also an important parameter, called bit depth or color depth, which decides the
number of colors represented by YUV. In the earlier systems, usually very low color
depth is used due to the hardware limitation, e.g., 4-bit color or 8-bit color (use 4 or
8 bits to represent all the colors directly, not for each color component). Nowadays,
24-bit color (8 bits for each color component) is mainstream, but higher bit depth
