Black area discrimination system for ink jet color printing and

Details Black area discrimination system for ink jet color printing and Black area discrimination system for ink jet color printing and

1995-10-13

1997-12-16

Bost, Dwayne

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358529, 358538, 347 43, 347 40, G06K 1500, G03F 308, H04N 146

Patent

active

056994923

ABSTRACT:
In a printing system constituted by a host computer and a printer, in an operating system of the host computer, a GDI module receives a drawing command from an application, and converts this drawing command into another drawing command which can be understood by a printer device driver. In the device driver, first, a preprocessor receivers the drawing command from the GDI module, and detects black areas contacting with color areas in figures or characters in a page on the basis of this received drawing command. Next, the preprocessor revises the drawing command so that the color of black areas contacting with color areas is changed from pure black to composite black. After this, the revised drawing command is sent to a rasterizer and a half toning portion sequentially, and converted into bit map data which can be understood by the printer. This bit map data is supplied to the printer through a print manager.

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