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Аннотация:The aim of our study was to find out the role of perceived illumination in lightness estimation in real 3D scene. In accordance with albedo hypothesis an apparent illumination and lightness are coupled in a visual image and their correlation depends on an apparent slant of a surface (Gilchrist A., 1977 Science, 195, 185-187). Twelve observers viewed pictures attached to a surface perceived as convex or concave depending on conditions of viewing: through the pseudoscope or without it. We used lightness illusions as pictures. Observers were asked to match in lightness patches from illusion pictures and from the Muncell neutral scale. The magnitude of lightness illusions was measured for both conditions. The results showed that the change in the magnitude of lightness illusions could be explained in accordance with albedo hypothesis.