Game Development Reference
In-Depth Information
Fig. 2.4
sRGB, Adobe RGB
color and CIE xy
chromaticity diagram.
Attribution: “CIExy1931
AdobeRGB versus sRGB”
by Mbearnstein37—own
work. Licensed under
Creative Commons
Attribution-Share Alike 3.0
via Wikimedia Commons
historically proposed for black-and-white/color TV compatible transmission. Y is
the existing luminance signal for black-and-white TV broadcasting, and UV signal
are added for color information. YIQ is similar to YUV, and the Y component is
same in the two color spaces. I and Q represent the chrominance information and
can be thought of as a new coordinate system rotated from UV coordinate with 33
ⓦ
.
YCbCr is also similar to YUV and YIQ, but it is usually used for digital video. More
details about digital video can be found in Sect.
2.2
. The above color spaces can be
converted from and to each other. Here we list frequently used color spaces conver-
sion in video coding for reference, including YUV and YCbCr converting from or
to RGB. YUV and RGB conversion is shown as follows:
⊡
⊤
⊡
⊤
⊡
⊤
Y
U
V
0
.
299
0
.
587
0
.
114
R
G
B
⊣
⊦
=
⊣
⊦
⊣
⊦
−
0
.
147
−
0
.
289
0
.
436
(2.3)
0
.
615
−
0
.
515
−
0
.
100
⊡
⊤
⊡
⊤
⊡
⊤
R
G
B
1
1
1
0
1
.
140
Y
U
V
⊣
⊦
=
⊣
⊦
⊣
⊦
−
0
.
395
−
0
.
581
0
(2.4)
2
.
032
YCbCr and RGB conversion defined BT. 601 (BT601) (BT601-5
1995
), which
is used for digital standard definition TV broadcasting.
