Color space Color space is the method of a kind of maths that shows color, appoint and people produces color with it, make color visualize. The color in color space uses the three-dimensional coordinate that represents 3 parameter to appoint normally, what these parameter describe is color the position in color space, but telling us is what color, its color should depend on the coordinate that we use.
The space of a kind of color that uses tonal, degree of saturation and lightness construction, be called HSB(hue, space of color of Saturation And Brightness) . RGB(red, green And Blue) and CMY(cyan, magenta And Yellow) is the most popular color space, they are the color space related to equipment, former use on monitor, latter is used on the equipment that print.
RGB(red, green And Blue) and CMY(cyan, magenta And Yellow) is the most popular color space, former use on monitor, latter is used on the equipment that print.
From the technology angle distinguishs, color space can consider to divide 3 kinds:
RGB color space / space of computer graph color: This kind of model basically is used at the color of television and computer to show a system. For example, RGB, HSI, the color space such as HSL and HSV.
XYZ color space / CIE color space: Space of this kind of color is the color space that defines by international Commission on Illumination, serve as normally internationally color space standard, use as the basic magnanimity method of color. For example, CIE 1931 XYZ, l*a*b, the color space such as L*u*v and LCH can regard transitional changeover as the space.
YUV color space / space of TV system color: By the drive and develops color space of broadcasting television demand, main purpose is through compressing chroma information broadcasts with effective ground colour television image. For example, YUV, YIQ, ITU-R BT.601 Y'CbCr, the color space such as ITU-R BT.709 Y'CbCr and SMPTE-240M Y'PbPr. The changeover 　 different color of color space can concern to change each other through certain maths:
Can alternate directly between some color space. For example, RGB and HSL, RGB and HSB, RGB and R'G'B' , r'G'B' and Y'CrCb, CIE XYZ and CIE L*a*b* .
Cannot alternate directly between some color space. For example, RGB and CIE La*b* , CIE XYZ and HSL, HSL and Y'CbCr, space of other facial expression undertakes the commutation need have the aid of between them transfer.
The changeover relation between two color space uses R'G'B' and Y'CbCr next type represent:
Y = 0.299R 0.587G 0.114B
Cr = (0.500R - 0.4187G - 0.0813B) 128
Cb = (-0.1687R - 0.3313G 0.500B) 128Of colour television make type and its color vacuum 1, the active colour television on the world before colour television makes type 　 look makes type have 3 kinds: NTSC is made, PAL is made and SECAM is made. Here does not include HDTV (High-Definition Television) of high definition colour television.
Colour television of NTSC(National Television Systems Committee) is made was 1952 the standard of colour television broadcast that Committee on Standard of American country TV defines, call orthogonality to balance amplitude modulation to make. The country of major the Western Hemisphere such as the United States, Canada, and Japan, Korea, Philippine the Taiwan that waits for country and China uses this kind to make type.
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