Image processing apparatus and control method thereof generating quantized based on multinary color data and a threshold matrix

An image processing apparatus operable to generate data for printing an image onto a printing medium using a plurality of color materials, the image processing apparatus comprising:

• a color separation unit configured to generate a plurality of color image data corresponding to the plurality of color materials based on image data;
• a generation unit configured to generate multinary color data corresponding to a combination of the plurality of color materials based on the plurality of color image data;
• and
• a quantization unit configured to generate quantized data corresponding to each of the plurality of color materials based on the multinary color data and a threshold matrix,
• wherein the quantization unit calculates a generative probability of respective multinary colors by counting a number of respective multinary colors to be generated based on a plurality of quantized data obtained by quantizing the plurality of color image data generated based on the image data using threshold matrices, corrects a quantization threshold based on the calculated generative probability of respective multinary colors, and generates the quantized data.

A control method of an image processing apparatus operable to generate data for printing an image onto a printing medium using a plurality of color materials, the control method comprising:

• performing color separation to generate a plurality of color image data corresponding to the plurality of color materials based on image data;
• generating multinary color data corresponding to a combination of the plurality of color materials based on the plurality of color image data;
• and
• quantizing each of the plurality of color materials based on the multinary color data and a threshold matrix to generate quantized data,
• wherein, in the generating, a generative probability of respective multinary colors is calculated based on the plurality of color image data generated based on the image data, and
• in the quantizing, a quantization threshold is corrected based on the calculated generative probability of respective multinary colors and the quantized data is generated.

A non-transitory computer-readable recording medium storing a program for causing a computer to execute a control method of an image processing apparatus operable to generate data for printing an image onto a printing medium using a plurality of color materials, the control method comprising:

• performing color separation to generate a plurality of color image data corresponding to the plurality of color materials based on image data;
• generating multinary color data corresponding to a combination of the plurality of color materials based on the plurality of color image data;
• and
• quantizing each of the plurality of color materials based on the multinary color data and a threshold matrix to generate quantized data,
• wherein, in the generating, a generative probability of respective multinary colors is calculated based on the plurality of color image data generated based on the image data, and
• in the quantizing, a quantization threshold is corrected based on the calculated generative probability of respective multinary colors and the quantized data is generated.