Abstract: To provide an output image of high quality with no graininess produced. An image processing method for controlling a starting point which produces a black component between vertices showing a plurality of chromatic colors and a vertex showing a black in a reproducible color space of a color output apparatus when a look-up table for converting an input color signal into a plurality of color components including a black component is prepared, which controls the starting point producing said black component based on the value of a complementary color component corresponding to a chromatic color which is inconspicuous in the graininess of a black recording material in an output image.

Abstract: A color reproduction region of an image formation apparatus is to be effectively used and characteristic in lightness, hue and chroma is to be smoothed. In case of creating tables for separating color into color of coloring agent available in the image formation apparatus, a maximum line in the color reproduction region of the image formation apparatus is defined, internal lines in the color reproduction region of the image formation apparatus are defined and the tables are created by performing interpolation processing on the basis of the maximum line and the internal lines.

Abstract: A light transmission fiber illuminating device having a transparent body is provided with an opening containing inorganic particles with an illuminated or a silicated property coated with oil. A transparent cap covers up the opening of the transparent body.