Image recording device for recording multicolor images by settin

Details Image recording device for recording multicolor images by settin Image recording device for recording multicolor images by settin

1997-07-09

1999-03-16

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358533, H04N 121

Patent

active

058837256

ABSTRACT:
An image recording method in which a head, in which a plurality of recording elements are arranged in the main scanning direction, is moved in the sub-scanning direction, one of densities and area rates of respective pixels is varied in accordance with image densities, respective colors of yellow, magenta, cyan and black are combined so as to record multicolor images, the method including the step of: setting a ratio of dots, whose longitudinal direction period is in the sub-scanning direction, of the respective colors of yellow, magenta, cyan and black to 1:3/4:3/5:1/2, where any of these colors may be used as a standard for the ratio. Also, setting a magnification of dots of the respective colors of yellow, magenta, cyan and black, whose longitudinal direction period is in the sub-scanning direction, each of the three of said four respective colors being set to a different non-integer with respect to said fourth color, varying the dots, and whose transverse direction period is in the main scanning direction, by unit of a dot in order to reduce the resolution in the main scanning direction.

REFERENCES:
patent: 4958218 (1990-09-01), Katayama et al.
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patent: 5394252 (1995-02-01), Holladay et al.
patent: 5469266 (1995-11-01), Usami et al.
patent: 5494361 (1996-02-01), Sonoda
patent: 5548407 (1996-08-01), von Kienlin
Y. Sonoda et al., "The Effects of a Pixel Layout on the Quality of Halftone Images Produced by Louver", 9th Int'l Congress on Advances in Non-Impact Printing Tech., Jp. Hardcopy '93, pp. 342-345.

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