Color conversion method for preferred color tones
A color conversion method for preferred color tones to change original color in a color image into a preferred one. The invention first sets chromaticity of the selecting original color and corresponding preferred color, then takes them as the basic points to establish a tone action space of the two color according to a color tone action distance. The two spaces are then joined to form a color conversion space and to determine a vector from the original color to the preferred color for converting the colors in the color conversion space into the new color. Finally, the color conversions from the original color to the new color are made to generate a new color image with the preferred color tone. The invention only converts the original colors in the color conversion space into new colors to get a new color image with preferred color tones. The selecting original color and corresponding preferred color pair can be plural in the invention.
1. A color conversion method for preferred color tones to convert at least one selecting original color in an original color tone image into a preferred color in a preferred color tone, forming a color image with the preferred color tone, the method comprising the steps of:
setting the original color and the preferred color by selecting their chromaticity of a color image in a color space;
establishing color tone action spaces, where the original color and the preferred color are taken as their basic point, respectively, along with a color tone action distance as the range to establish three-dimensional color tone action spaces of the colors;
forming a color conversion space by joining the color tone action spaces of the original color and the preferred color, and determining a vector in the color conversion space from the original color to the preferred color;
making a color conversion in the color conversion space to generate a new color according to the vector; and
converting the colors of the color image using the correspondence relation between the original color and the new color, creating the new color image with the preferred color tone.
2. The color conversion method of claim 1 , wherein the color tone action space in the step of establishing a color tone action space is selected from a group consisting of rectangular, spherical, cylindrical, elliptical, and polygon space.
3. The color conversion method of claim 1 , wherein the step of forming a color conversion space and determining a vector forms the color conversion space with reference to boundaries of the color space.
4. The color conversion method of claim 1 , wherein the step of making a color conversion to generate a new color makes the color conversion through interpolation and color tone adjustment in the color space.
5. The color conversion method of claim 1 , wherein when there is a plurality of the selecting original colors and the preferred colors the step of making a color conversion to generate a new color is followed by the steps of:
confirming that the intersection among the color conversion spaces is occurred; and
calculating the new color in the intersection area.
6. The color conversion method of claim 5 , wherein the new color in the step of calculating the new color in the intersection area is an average one calculated from the new colors of the intersection area of each color conversion spaces.
7. The color conversion method of claim 1 , wherein when there is a plurality of the original colors and the preferred colors and one of the original color is the same as one of the preferred color, the two color tone action spaces established from the original color and corresponding preferred color are the same and the vector is a null vector in the color conversion space.