Patent ID: 7859730

Claim:
A printer with a scanner function printing images taken in by a scanner, comprising: an image data acquirer inputting image data composed of a first set of prescribed elementary colors; a data converter converting said inputted image data into data for printing composed of ratios of occurrence of dots of two or more dot sizes on the basis of corresponding relationship between gradational expression of said first set of elementary colors and the ratios of occurrence of dots of the two or more dot sizes of a second set of elementary colors for printing; and a relationship controller that reduces a selected ratio of occurrence of dots of a comparatively small dot size selected from among the ratios of occurrence of dots of the two or more dot sizes of the second set of elementary colors in a gradient range where the selected ratio of occurrence of dots of the comparatively small dot size is below a prescribed threshold value by changing said corresponding relationship in the gradient range while said inputted image data are being converted into data for printing if said image data are inputted through said scanner by said image data acquirer and the image data are of a prescribed attribute.