Patent ID: 11924390
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An apparatus comprising:
a scanner that scans an image on a document to generate image data to be used in color reduction processing;
a controller;
wherein the controller performs the color reduction processing for quantizing a color in the generated image data,
wherein the controller changes, in a case where brightness of an edge pixel indicating an edge portion in an image based on the image data with the color quantized is equal to or higher than a threshold value, a pixel value of the edge pixel to a pixel value of a color of a pixel having highest brightness among pixels surrounding the edge pixel, and changes, in a case where the brightness of the edge pixel is lower than the threshold value, the pixel value of the edge pixel to a pixel value of a color of a pixel having lowest brightness among the pixels surrounding the edge pixel, and
wherein the controller compresses the image data in which the pixel value of the edge pixel is changed while dividing the image data by color, and
a network interface that transmits the compressed image data via a network, and
wherein decompressed image data of the compressed image data is transmitted to a printer and the printer prints onto a medium.