6 Influence of the atmosphere on the colours
With the naked eye it was not possible to see any differences in the colour of all the products. Most important are the colour differences in roofing tiles. Because of this a colorimeter was used.
6.1 Test description
The used colorimeter measures a Lab colour space, which is a colour-opponent space with dimension “L” for lightness and “a” and “b” for the colour-opponent dimensions, based on nonlinearly compressed coordinates. The L*a*b* colour space includes all perceivable colours, which means that its colour gamut exceeds those of the RGB and CMYK...