Multidimensional structure of colorfulness : chroma variation in color images of natural scenes

In a previous investigation it was found that the perceptual quality of images of natural scenes depended upon their subjective colorfulness when images were transformed by varying of chroma. The transformations were performed over the color point distributions in the CIELUV perceptuallu uniform color space where each color point represented one pixel of a corresponding image. The experiments with uni-dimentional scaling of colorfulness have shown that the colorfulness can be represented as a linear combination of average chroma. however, such a representation held only within each scene: there was no regular rule to compare different scenes even with significantly different average chroma of the original images. The results of multidimensional scaling of colorfulness re veal the multidimensional structure of this attribute. Possible interpretations of subjective dimensions are discussed.