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

Claim 5:
6. A method performed by a controller of an apparatus having a scanner that scans an image on a document to generate image data to be used in color reduction processing and a network interface, the method comprising:
performing the color reduction processing for quantizing a color in the generated image data;
changing, 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 changing, 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;
compressing the image data in which the pixel value of the edge pixel is changed by the changing while dividing the image data by color, and
transmitting the compressed image data using the network interface via a network, and
printing decompressed image data of the compressed image data via a printer.