The present study considers a fuzzy color system in which three membership functions are constructed on a color triangle. This system can process a fuzzy input to a color triangle system and output the center of gravity of three weights associated with respective grades. Three fuzzy sets (red, green, and blue) are applied to the color triangle relationship. By treating the attributes of redness, greenness, and blueness on the color triangle, a target color can be easily obtained as the center of gravity of the output fuzzy set. In the present paper, 0% triangle is consisted of the lines of 0% redness, 0% greenness, and 0% blueness of the attributes. The colors on 0% triangle, map into the right corner of tone triangle (on C or near C). The difference between the resulting inference output and the transforming output is shown by the nonlinear characteristic between the redness ro of the output (consequent) and the chromaticness co of the output (transformation). The vagueness is influenced by the possibility.