Color image printing apparatus
First Claim
1. A color image printing apparatus comprising:
- dot printing means for printing dots of at least two colors on a printing medium; and
control means for controlling said dot printing means such that only a predetermined dot or dots in accordance with a density of each pixel in units of colors in a dot matrix corresponding to one pixel are printed,wherein positions of printed dots in the dot matrix are determined such that angles of two texture directions of the printed dots which are generated upon printing of pixels arranged in a two-dimensional manner are different for each color.
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Accused Products
Abstract
A color image printing apparatus prints one pixel by superposing a predetermined dots of three colors within a 3×3 dot matrix in accordance with a density of the pixel. The positions of the printed dots within the dot matrix are stored as a dot pattern for each color. One dot pattern is used for each of a plurality of densities included in one density range. The printing energy for each of the dots included in the dot pattern is controlled in accordance with the density level of the pixel. The dot pattern is different for each color and three dot patterns are stored for each color and for each density range. These three dot patterns are repeatedly used for every three pixels which are continuous in the horizontal direction. These three dot patterns have two or three texture directions. The texture direction other than the vertical direction is different for each color.
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Citations
9 Claims
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1. A color image printing apparatus comprising:
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dot printing means for printing dots of at least two colors on a printing medium; and control means for controlling said dot printing means such that only a predetermined dot or dots in accordance with a density of each pixel in units of colors in a dot matrix corresponding to one pixel are printed, wherein positions of printed dots in the dot matrix are determined such that angles of two texture directions of the printed dots which are generated upon printing of pixels arranged in a two-dimensional manner are different for each color. - View Dependent Claims (2, 3)
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4. A thermal color image printing apparatus comprising:
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dot printing means for printing dots of at least two colors on a printing medium; means for moving one of said dot printing means and printing medium with respect to the other of said dot printing means and printing medium, to form a dot matrix on the printing medium; table means for storing position data indicating a predetermined dot or dots in the dot matrix corresponding to a printing region of a single pixel and numerical data indicating an energy value which is applied to said dot printing means in order to print the dots, the position data being stored as a dot pattern, the dot pattern of each having two texture directions, one being a direction which is common to all the colors and along which one of said dot printing means and said printing medium is moved by said moving means and the other being an arbitrary direction which is different for each color; and means, interlinked with said moving means, for reading out the position data and numerical data corresponding to each pixel of each color from said table means for each printing position of each pixel and for controlling said dot printing means. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification