Economic value of certain fabrics depends upon the consumer evaluation of luster, especially in house-hold and apparel uses. Luster is the disply of different intensities of light reflected both specularly and diffusely from different parts of a surface exposed to the same incident light. Hence there are several devices which are designed to measure the luster and gloss. Some of them are specially designed for textiles. For specification of luster numerically in all methods, have been used the ratio of specular reflected light at specific angle and defused reflected light at other angle. These methods do not presented a general vision of the luster of surfaces. Also these methods examine the surface just in speciall angle. The presented method in this research for all samples, takes the photograph of fabrics in various directions in constant conditions, and derives the luminance from images and analyses it to obtain an index for the luster of fabrics. Next, the samples are clustered by people and fuzzy set theory in six ltr"
