Pratt F, MacDonald R R
Percept Mot Skills. 1980 Jun;50(3 Pt 2):1127-=38. doi: 10.2466/pms.1980.50.3c.1127.
The brightness of colors in a number of paintings by Francis Pratt appeared to vary as a function of the viewing distance. These pictures were composed of narrow strips of different colors varying in brightness and saturation. Five experiments were undertaken to replicate and study this effect under controlled conditions using heterochromatic brightness matching of various pairs of colored stimuli. The subjects were first-year students in psychology, participating as a course requirement. The number of subjects varied in the different experiments, between 6 and 9. The relative brightness of blue as compared to red, orange, and yellow-green varied as a function of viewing distance. The relative brightness of the blue decreased as distance increased. By varying the physical size of the stimuli it was possible to keep the angle subtended at the retina constant for two distances and the effect remained. Any explanation must therefore account for the finding that the effect is not due to the apparent size of th stimuli.
弗朗西斯·普拉特的一些画作中颜色的亮度似乎会随着观看距离而变化。这些画作由不同亮度和饱和度的窄色带组成。进行了五项实验，在可控条件下使用各种颜色刺激对的异色亮度匹配来复制和研究这种效果。受试者是心理学专业的一年级学生，作为课程要求参与实验。不同实验中的受试者数量有所不同，在6到9人之间。与红色、橙色和黄绿色相比，蓝色的相对亮度随观看距离而变化。随着距离增加，蓝色的相对亮度降低。通过改变刺激的物理尺寸，可以使在两个距离下视网膜上所张的角度保持恒定，而这种效果仍然存在。因此，任何解释都必须考虑到该效果并非由于刺激的表观大小这一发现。
