This chapter examines theoretical positions on the closely related question of perception of the illumination. An important theoretical question, closely related to the question of how well illumination is perceived, concerns the relationship between perceived illumination and perceived surface lightness. Four major positions can be distinguished: lightness is derived from perceived illumination; lightness and perceived illumination are mutually dependent, but neither is prior; lightness and perceived illumination are simply independent; veridicality of lightness and perceived illumination are negatively correlated.
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