Ink jet recording apparatus and method using plural types of ink

Details Ink jet recording apparatus and method using plural types of ink Ink jet recording apparatus and method using plural types of ink

1995-10-23

1999-11-02

Le, N.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 5, 395109, B41J 221, B41J 2938, G06F 1500, G06K 100

Patent

active

059756780

ABSTRACT:
An image is recorded on a recording medium by recording dots of a black ink and a color ink discharged onto the recording medium from a recording head. A boundary proximity-degree detecting circuit detects the degree of positional proximity, i.e., closeness, between the recording dots of the black ink and the recording dots of the color ink at the boundary between these dots. A dot substituting circuit performs, in accordance with the detected degree of positional proximity, substitution of the black pixels with recording dots of a color ink at the boundary. Thus, pixels of the image to be recorded are replaced with recording dots of a color ink by an extent which is determined based on the degree of positional proximity between the pixels of the different colors. A sharp black image can be obtained with minimized color mixing at the boundary between the black image region and the color region, regardless of the degree of positional proximity between these regions.

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