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. 2019 Jul 22;4(1):27.
doi: 10.1186/s41235-019-0174-3.

A grey area: how does image hue affect unfamiliar face matching?

Anna K Bobak  1 , Viktoria R Mileva  2 , Peter J B Hancock  2
Affiliations

A grey area: how does image hue affect unfamiliar face matching?

Anna K Bobak et al. Cogn Res Princ Implic. .

Abstract

The role of image colour in face identification has received little attention in research despite the importance of identifying people from photographs in identity documents (IDs). Here, in two experiments, we investigated whether colour congruency of two photographs, shown side by side, affects face-matching accuracy. Participants were presented with two images from the Models Face Matching Test (experiment 1) and a newly devised matching task incorporating female faces (experiment 2) and asked to decide whether they show the same person or two different people. The photographs were either both in colour, both in grayscale, or mixed (one in grayscale and one in colour). Participants were more likely to accept a pair of images as a "match", i.e. same person, in the mixed condition, regardless of whether the identity of the pair was the same or not. This demonstrates a clear shift in bias between "congruent" colour conditions and the mixed trials. In addition, there was a small decline in accuracy in the mixed condition, relative to when the images were presented in colour. Our study provides the first evidence that the hue of document photographs matters for face-matching performance. This finding has important implications for the design and regulation of photographic ID worldwide.

Keywords: Face matching; Face processing; ID checks; National security; Unfamiliar faces.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Examples of photographs (from left to right) from a Polish passport, a UK driving license, and a Polish identity card. Persons depicted in these images have given permission for them to be used as illustration
Fig. 2
Fig. 2
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
Fig. 3
Fig. 3
Differences in response bias across three hue conditions in experiment 1. Error bars represent the SEM
Fig. 4
Fig. 4
Differences in response bias across three hue conditions in experiment 2. Error bars represent the SEM
See this image and copyright information in PMC

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