Color Space
• Lightness
• Intensity is radiant power in a particular direction.
• Radiance is intensity per unit projected area.
• Color Theory
• Color Addition

\$R = R_1+R_2\$
\$G = G_1+G_2\$
\$B = B_1+B_2\$

• Chromaticity diagrams
• The Chromaticity diagram is a two-variable system for specifying the hue and saturation of colors (together called chroma) producible using a particular set of primaries.
• Gamut mapping
• xyY color space
• The xyY color space is a transformation of the CIE XYZ color space onto 2 dimensions.
• This allows the illustration of color using a graph like the Chromaticity Diagram and it removes the luiminance component of color.
• The CIE 1924 photopic luminosity function is included in the CIE 1931 color-matching functions as the y function.
• Luminosity function
• The formulas for determining xyY are as follows:
• x = X/(X+Y+Z)
• y = Y/(X+Y+Z)
• Y = Y
• Recalculate X and Z
• z = Z/(X+Y+Z) = (1-x-y)
• X = (Y/y)*x
• Z = (Y/y)*z = (Y/y)*(1-x-y)
• Luma+2 color difference signals
• YUV
• YUV and Y'UV were used for a specific analog encoding of color information in television systems, while YCbCr was used for digital encoding of color information suited for video and still-image compression and transmission such as MPEG and JPEG. • approximate the way humans perceive and interpret color
• Subtractive
• CMYK
page revision: 153, last edited: 03 May 2016 03:48
Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License