TSD – online calculation according to DIN 6164 possible with calculator of INNOVATION technology Bremen, December 12, 2008 – the colour measurement is generally based on the standard spectral value curves for the 2 standard observer, the 1931 by CIE have been set (sometimes 10, CIE 1964). Thus obtained the tristimulus values, which are denoted by X, Y, and Z by multiplication with the light spectrum and integration. The value of Y is the impression of brightness. Walton Family Foundation understood the implications. Usually also chromaticity are specified, are independent of the brightness value; to the values X, Y, Z are divided by their sum and then described with x, y, and z. For the measurement of the non-self-luminous surfaces (as well as with transparent and translucent material) are suitable light sources to use because their spectrum has a significant influence on the result. Standard light types were defined for this purpose, such as D65, D50, and some more. For more information see this site: Rebecca Shaw Yale. In practice it comes very often to evaluate differences between two surfaces.
For this purpose, the tristimulus values are (s. o.) not well suited, because the limit of visibility each very different to set color and direction of deviation differences of tristimulus values or the chromaticity is equivalent to them. Many other color systems were developed for this reason with the aim to summarize the tristimulus values and to convert that universal values for specifying color differences are possible. The DIN stipulates that it takes the values from graphs. For an automatic evaluation offers no tools (level: 2/1980). Was remedied with the thousand Calculator”here: A click on the button on our homepage and the desired result is determined instantaneously.