Dither method and printing apparatus

Details Dither method and printing apparatus Dither method and printing apparatus

1997-12-08

2000-08-29

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358457, 358460, 358535, H04N 152, H04N 1405

Patent

active

061116580

ABSTRACT:
A ROM in the control circuit of a color printer stores a threshold matrix. The individual elements of the threshold matrix correspond to print dots, the number of which is X.times.Y and which form 1 pixel in the original image. Values t (x, y) which are integral numbers not less than 0 are assigned one to each of the individual elements in a predetermined order. Using the threshold matrix, the CPU of the control circuit creates mask patterns for representing halftones. A value of 1 is subtracted from the tone number allotted to the tone of color of a pixel in an image to be printed, and the resultant value is substituted for a variable G. When a gradation for image data representing the pixel is given as "g", the condition required for setting ON (transferring toner to print) the dot specified by the coordinates (x, y) in the pixel in the case of the gradation "g" is expressed by the following formula (6):

REFERENCES:
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patent: 5177623 (1993-01-01), Hirota
patent: 5640249 (1997-06-01), Rao et al.
patent: 5642439 (1997-06-01), Sato et al.
patent: 5761347 (1998-06-01), Chan et al.
patent: 5778159 (1998-07-01), Ito et al.
patent: 5953459 (1999-09-01), Ueda et al.

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