The use of colour vision in distinguishing light from material
Colour vision is useful not just for identifying colors, but for determining the structure of the visual world. In this talk I explore the role of colour vision in helping to distinguish spatial variations in light, e.g. shading, shadows and highlights, from spatial variations in material properties such as paint, stain and pigmentation. I explore this role of colour vision using both laboratory stimuli as well as images of everyday scenes. Occasionally colour vision’s role in distinguishing light from material leads to errors, some examples of which will be shown.