Image processing apparatus and method thereof

An image processing method comprising the steps of:

• color-converting input image data using a three-dimensional table selected from a plurality of three-dimensional tables and an interpolation process;
• obtaining error-corrected data by adding error data to the color-converted image data;
• selecting a dot pattern from a combination of dot patterns selected from a plurality of combinations of dot patterns based on the error-corrected data, and outputting the selected dot pattern as an output dot pattern;
• obtaining data, which indicates an output color corresponding to the output dot pattern, by referring to an output density table;
• and
• obtaining the error data by calculating a difference between the data which indicates the output color, and the color-converted image data,
• wherein the plurality of three-dimensional tables include three-dimensional tables in correspondence with the output color.

A computer readable medium storing a computer-executable program comprising program code for causing a computer to perform an image processing method, the method comprising the steps of:

• color-converting input image data using a three-dimensional table selected from a plurality of three-dimensional tables and an interpolation process;
• obtaining error-corrected data by adding error data to the color-converted image data;
• selecting a dot pattern from a combination of dot patterns selected from a plurality of combinations of dot patterns based on the error-corrected data, and outputting the selected dot pattern as an output dot pattern;
• obtaining data, which indicates an output color corresponding to the output dot pattern, by referring to an output density table;
• and
• obtaining the error data by calculating a difference between the data which indicates the output color, and the color-converted image data,
• wherein the plurality of three-dimensional tables include three-dimensional tables in correspondence with the output color.