IMAGE PROCESSING DEVICE, METHOD, PROGRAM AND RECORDING MEDIUM RECORDING THE PROGRAM

When the image data having a predetermined gradation value for each pixel is input, and the image data is searched from the initial pixel and the total of the gradation values of the pixels, including the searched pixels, becomes a predetermined threshold value or more, a dot is generated at the center of the gravity position as a quantized pixel group. In the searching, an unprocessed pixel closest to the center of gravity position, including this pixel, is selected. If there are a plurality of unprocessed pixels, selection is performed at random. For the pixel selection, a pixel closest to the center position computed from the positional coordinates may be selected, rather than the center of gravity. Also a dot may be generated at the center position of the quantized pixel group.