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Observers reported \nwhether there was a change in reflectance of a test surface in the scene. \nThe scenes were obtained with a hyperspectral imaging system and included \nvariously trees, shrubs, grasses, ferns, flowers, rocks, and buildings. \nDiscrimination performance, quantified on a scale of 0 to 1 with a \ncolor-constancy index, varied from 0.69 to 0.97 over 21 scenes and two \nilluminant changes, from a correlated color temperature of 25,000 K to \n6700 K and from 4000 K to 6700 K. The best account of these effects was \nprovided by receptor-based rather than colorimetric properties of the \nimages. Thus, in a linear regression, 43% of the variance in constancy \nindex was explained by the log of the mean relative deviation in spatial \ncone-excitation ratios evaluated globally across the two images of a \nscene. A further 20% was explained by including the mean chroma of the \nfirst image and its difference from that of the second image and a further \n7% by the mean difference in hue. Together, all four global color \nproperties accounted for 70% of the variance and provided a good fit to \nthe effects of scene and of illuminant change on color constancy, and, \nadditionally, of changing test-surface position. By contrast, a \nspatial-frequency analysis of the images showed that the gradient of the \nluminance amplitude spectrum accounted for only 5% of the variance.<\/jats:p>","DOI":"10.1017\/s0952523806233455","type":"journal-article","created":{"date-parts":[[2006,9,8]],"date-time":"2006-09-08T22:56:08Z","timestamp":1157756168000},"page":"341-349","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":45,"title":["Color constancy in natural scenes explained by global image \nstatistics"],"prefix":"10.48130","volume":"23","author":[{"given":"DAVID H.","family":"FOSTER","sequence":"first","affiliation":[]},{"given":"KINJIRO","family":"AMANO","sequence":"additional","affiliation":[]},{"given":"S\u00c9RGIO M.C.","family":"NASCIMENTO","sequence":"additional","affiliation":[]}],"member":"27968","published-online":{"date-parts":[[2006,9,6]]},"reference":[{"key":"S0952523806233455_ref043","doi-asserted-by":"crossref","unstructured":"Tolhurst, D.J. , Tadmor, Y. , & Chao, T. 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