Image processing apparatus configured to perform pixel dithering based on dithering table and pass information

摘要

An image processing apparatus includes a dithering unit that retains a dithering table; a gray-scale value input unit that inputs, to the dithering unit, a gray-scale value of each pixel constituting image data of a predetermined color; and a pass information input unit that inputs, to the dithering unit, pass information indicating whether printing is a first pass to perform printing on a recording medium yet to be printed or a second pass to perform reprinting on the same surface of the recording medium already subjected to printing. The dithering unit performs dithering on each pixel based on the dithering table, the gray-scale value, and the pass information.

主权项

1. An image processing apparatus comprising:
a dithering unit that retains a dithering table and a threshold, the dithering table providing a matrix of pixels, each of the pixels having a corresponding value; a gray-scale value input unit that inputs, to the dithering unit, a gray-scale value of each pixel constituting image data of a predetermined color; and a pass information input unit that inputs, to the dithering unit, pass information indicating whether printing is a first pass to perform printing on a recording medium yet to be printed or a second pass to perform reprinting on the same surface of the recording medium already subjected to printing, wherein the dithering unit determines whether a dot is printed or not on each of the pixels in the matrix based on the pass information and by comparing magnitudes of the corresponding value, the threshold, and the gray-scale value with one another.