Figure 2.

Simulations of color adaptation to a change in environment or change in observer. Top left and middle: roughly the same scene in two seasons. Bottom left and middle: adapting to the color statistics in each season biases color appearance by toning down the dominant hues and increasing the salience of novel hues (e.g. increasing the perceived saturation of greens in the arid scene). Thus the same observer codes color differently in the two environments. Top right: the middle, arid scene viewed through the lens of an older observer. Bottom right: adapting to the spectral changes introduced by the lens removes most of the color bias. Thus the two different observers code color similarly when adapted to the same environment.