In this paper qualitative colours are named by defining intervals on reference systems built on the Hue Saturation and Lightness (HSL) colour space. The new model for Qualitative Colour Description (QCD) distinguishes rainbow colours, pale, light, dark colours and colours in the grey scale. For comparing the qualitative colours described, a similarity measure based on interval distances (SimQCDInt) is introduced. HSL intervals for each colour label have been defined experimentally using data obtained in a user survey. Preliminary experiments have also been conducted in order to check that the proposed approach is consistent with human appreciations of colour similarity and complementarity. 
A model for qualitative colour comparison using interval distances