Fig. 2
From: A grey area: how does image hue affect unfamiliar face matching?
Images showing the three conditions for three different identities. Top row shows “colour”, middle row shows “grayscale”, and bottom row shows “mixed” conditions. All pairs are same-image pairs. Copyright restrictions prevented the publication of the original photographs. Individuals depicted in this figure did not appear in the experiment. All have given permission for their images to be reproduced