Image processing apparatus and its method, and computer-readable storage medium

A method for image processing by an image processing apparatus which inputs data obtained by reading a chart of highlights formed by an image forming apparatus and generates a correction condition for a first image reading unit or a second image reading unit based on the data, the method comprising:

• reading the chart of highlights formed in the image forming apparatus by the first image reading unit;
• reading the chart of highlights by the second image reading unit;
• calculating a difference between an image signal read by the first image reading unit and an image signal read by the second image reading unit;
• and
• generating a correction condition for correcting reading resolving power of the first image reading unit or reading resolving power of the second image reading unit corresponding to the difference.

A non-transitory computer-readable storage medium storing a program which causes a computer to execute a method for image processing by an image processing apparatus which inputs data obtained by reading a chart of highlights formed by an image forming apparatus and generates a correction condition for a first image reading unit or a second image reading unit based on the data, the method comprising:

• reading the chart of highlights formed in the image forming apparatus by the first image reading unit;
• reading the chart of highlights by the second image reading unit;
• calculating a difference between an image signal read by the first image reading unit and an image signal read by the second image reading unit;
• and
• generating a correction condition for correcting reading resolving power of the first image reading unit or reading resolving power of the second image reading unit corresponding to the difference.