Imagine that equivalent values of the opposing colours are cancelling each other out, reducing the saturation and intensity of those colours. For correct placement, remember that red is on the right, and blue is on the bottom.Ĭolours are more neutral and grey toward the centre of the colour space, along the L axis. If you found our previous mnemonic aid of POLO helpful, you can use RGBY to remember the colour pairs. This places red to the right, green to the left, blue at the bottom, and yellow at the top. The standard two-dimensional depiction is of only the a and b axes, with a as the horizontal axis and b as the vertical axis. In contrast, the a and b axes are chromatic, describing the colour character and the type of light. Here we are dealing with the volume rather than the kind of light. The L axis is considered achromatic meaning without colour. Notice that there are no negative values on the L axis as we can’t have less than zero light, which describes absolute darkness. It’s comprised of three axes: L represents darkness to lightness, with values ranging from 0 to 100 a represents greenness to redness with values of -128 to +127 and b represents blueness to yellowness also with values from -128 to +127. In section, 4.2, we mentioned the Lab colour space as a natural outgrowth of understanding the function of opponency in human vision. The latter two are particularly important for colour management. Three core definitions provided by the CIE are the standard observer, the Lab colour space, and Delta E measurements. The CIE (Commission Internationale d’Eclairage or International Commission on Light) is a scientific body formed by colour scientists in the 1930s that has provided much of the fundamental colour knowledge we possess today. Colour Management in the Graphic TechnologiesĤ.4 Lab Colour Space and Delta E Measurements
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