What is Cielab used for?
CIELAB or CIE L*a*b* is a device-independent, 3D color space that enables accurate measurement and comparison of all perceivable colors using three color values. In this color space, numerical differences between values roughly correspond to the amount of change humans see between colors.
What is CIE 1931 chromaticity diagram?
The chromaticity diagram illustrates a number of interesting properties of the CIE XYZ color space: The diagram represents all of the chromaticities visible to the average person. These are shown in color and this region is called the gamut of human vision.
What is xyY color space?
A Color Space is a completely-specified scheme for describing the color of light, ordinarily using three numerical values (called coordinates). A derivative of this color space, the CIE xyY color space, is often used as a way to graphically present the chromaticity of colors.
What is white in Cielab?
In CIELab, “white” is represented roughly as (100,0,0) which becomes (255,128,128) by that transformation. If you use 32-bit floating point images, then this last conversion is not needed and you can use (100.0,0.0,0.0) as white.
What is chromaticity diagram what it is used for?
Chromaticity diagram is a convenient space coordinate representation of all the spectral colours and their mixtures based on the tri-stimulus values of the primary colours contained by them. Figure below is a two dimensional representation of hue and saturation in the X-Y plane.
What is luminance and chromaticity?
Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue (h) and colorfulness (s), where the latter is alternatively called saturation, chroma, intensity, or excitation purity.
What does the CIE curve show and describe?
The CIE system characterizes colors by a luminance parameter Y and two color coordinates x and y which specify the point on the chromaticity diagram. Based on the fact that the human eye has three different types of color sensitive cones, the response of the eye is best described in terms of three “tristimulus values”.
What is tri stimulus value?
tristimulus system, a system for visually matching a colour under standardized conditions against the three primary colours—red, green, and blue; the three results are expressed as X, Y, and Z, respectively, and are called tristimulus values. The x and y values together constitute the chromaticity of a sample.
