COLOR MEMORY MATCHING ANALYZED USING DIFFERENT REPRESENTATION SPACES

The choice of the representation space is relevant when analysing the results of a colour memory experiment. If we are interested in determi ning which colours are best or worst remembered using the colour diffe rence between the reference and matching stimuli, we need spaces with a high degree of uniformity. In this paper, the results of a previous experiment with 10 colours, 100 observers and three time gaps have bee n processed in five representation spaces with different uniformity de grees: CIE La*b*, CIE L*u*v*, SVF Rlab and Llab. For most colours and in all the spaces, reference colours above a particular lightness val ue are remembered as even lighter, whereas below a certain value they are remembered as darker or equally light. Chroma either increases or suffers no variations. Changes in hue appear to be, in contrast, unsys tematic. These results basically agree with the previous literature. C IE La*b*, CIE L*u*v* and Rlab spaces yield practically identical resu lts. The best remembered colours are orange and oxide red, and yellow is the worst remembered colour. In the SVF space, the worst remembered colours are blue and yellow, although the results for pink become com parable as the delay increases. Pink is also the worst remembered colo ur in the Llab space.