RAL DESIGN D2 Colour fan

CIELAB Hue Colour Circle

Variety through unity – The RAL DESIGN SYSTEM Plus

In the last decades the demand for a more extensive colour system has grown because the RAL CLASSIC colour collection with 215 colours is relatively limited and has no systematic.

The RAL DESIGN system was mainly developed for the demanding decorative color design. It is the colour system based on the CIELab formula for architects, designers and advertising agencies.

With its 1825 systematically ordered, colorimetrically defined colour tones, the system is considered a perfect instrument for colour design.

Creative colour designs require a multitude of colour nuances – RAL fulfills this requirement with the highest precision.

The structure of the RAL DESIGN System is not arbitrary, but follows a colour measurement system internationally defined in 1976 by the CIE (Commission Internationale de l’Eclairage). The colour distances of the individual colours are defined colorimetrically by the CIELab colour distance, which is also anchored as a colour standard in DIN 6174. And this is what distinguishes the system from other colour systems.

The colour coding specifies the exact coordinates in the HLC colour space. This means that every RAL DESIGN colour can be found quickly at any time, because the colour designation already indicates the exact position in the colour space. The HLC-coordinates are the polar coordinates of the CIELab colour space. This makes a RAL DESIGN colour name of the form HHH LL CC intuitively understandable as:

H-Hue: Base colour tone in the colour circle (0-360°)
L-Lightness: percentage brightness
C-Chroma: percentage colour intensity (similar to saturation)