This standard defines a method of calculating coordinates of the approximately uniform CIE 1976 (Lab) colour space from tristimulus values X, Y, Z. A colour-difference formula is given as a Euclidean distance in that space which may be used to quantify small colour differences especially for object colours.
DIN 6174:2007 history
2012DIN EN ISO 11664-4:2012 Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4:2008); German version EN ISO 11664-4:2011
2011DIN EN ISO 11664-4:2011 Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4:2008); German version EN ISO 11664-4:2011
2007DIN 6174:2007 Colorimetric evaluation of colour coordinates and colour differences according to the approximately uniform CIELAB colour space
1979DIN 6174:1979 Colorimetric Evaluation of Colour Differences of Surface Colours According to the CIELAB Formula