Image processing apparatus and image processing method

An image processing method for performing screen processing on input image data via passes, the image processing method comprising:

• receiving the input image data or corrected image data as received image data and perform screen processing on the received image data to produce screen-processed image data;
• detecting a difference between low frequency components of the input image data and low frequency components of the screen-processed image data;
• and
• correcting pixel values in the input image data based on a detected difference to produce corrected image data,
• wherein at least one of the screen processing, the difference detection, and the input image data correction is repeated on a subsequent pass to convert the input image data to screen-processed image.

A non-transitory computer-readable medium storing a program to cause an image processing apparatus to perform an image processing method, the image processing method comprising:

• receiving the input image data or corrected image data as received image data and perform screen processing on the received image data to produce screen-processed image data;
• detecting a difference between low frequency components of the input image data and low frequency components of the screen-processed image data;
• and
• correcting pixel values in the input image data based on a detected difference to produce corrected image data,
• wherein at least one of the screen processing, the difference detection, and the input image data correction is repeated on a subsequent pass to convert the input image data to screen-processed image.