CIE (Commission International de l’ éclairage)
- device-independent color space
- describe all colors visible to the human eye based upon the average response from a set of people with no vision problems
CIE Common Forms
each contains the same colors, but they distribute colors differently:
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CIE xyz (1931) |
CIE L a*b* |
CIE L u’v’ (1976) |
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is based on a direct graph of the signals from each of the three types of color sensors in the human eye. These are also referred to as the X, Y and Z tristimulus functions (that were created in 1931). However, this representation allocates too much area to the greens — confining most of the apparent color variation to a small area |
remaps the visible colors so that they extend equally on two axes — conveniently filling a square. Each axis in the L*a*b* color space also represents an easily recognizable property of color, such as the red-green and blue-yellow shifts (used in the 3D visualization at the start of this tutorial). These traits make L*a*b* a useful color space for editing digital images, such as with Adobe Photoshop, GIMP, etc |
was created to correct for the CIE xyz distortion by distributing colors roughly proportional to their perceived color difference. A region that is twice as large in u’v’ will therefore also appear to have twice the color diversity — making it far more useful for visualizing and comparing different color spaces |
-(commission-international-de-l'-éclairage)/cie-xyz.png)
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-(commission-international-de-l'-éclairage)/cie-luv.png)