Image processing apparatus, image processing method, and non-transitory computer-readable storage medium

An image processing method, comprising:

• reading a first pattern on a recording medium to acquire read data including red, green, and blue (RGB) color space values, the first pattern including a plurality of patches in a plurality of tones;
• reading a second pattern on the recording medium to acquire colorimetric data, the second pattern including four reference patches of colors of cyan, magenta, yellow, and black, respectively,
• correcting the read data based on information indicating a relationship between a color and a position in the first pattern to reduce variation in readings due to a read position of the first pattern;
• converting the read data corrected into device-independent data;
• adjusting a color reproduction characteristic of an image forming device based on the device-independent data;
• and based on a comparison of the read data of the first pattern with the colorimetric data of the second pattern, calculating a color correction coefficient corresponding to the read position of the first pattern and correcting the read data with the calculated color correction coefficient.

A non-transitory, computer-readable storage medium storing computer-readable program code that causes a computer to execute an image processing method, the method comprising:

• reading a first pattern on a recording medium to acquire read data including red, green, and blue (RGB) color space values, the first pattern including a plurality of patches in a plurality of tones;
• reading a second pattern on the recording medium to acquire colorimetric data, the second pattern including four reference patches of colors of cyan, magenta, yellow, and black, respectively;
• correcting the read data based on information indicating a relationship between a color and a position in the first pattern to reduce variation in readings due to a read position of the first pattern;
• converting the read data corrected into device-independent data;
• adjusting a color reproduction characteristic of an image forming device based on the device-independent data;
• and
• based on a comparison of the read data of the first pattern with the colorimetric data of the second pattern, calculating a color correction coefficient corresponding to the read position of the first pattern and correcting the read data with the calculated color correction coefficient.