Ink-jet printing apparatus for printing with a plurality kinds of same color type inks having different density
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United States of America Patent
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Jun 27, 2000
Grant Date -
N/A
app pub date -
Dec 26, 1996
filing date -
Dec 29, 1995
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Abstract
In an apparatus for performing printing with a higher density ink and a lower density ink of the same color type, in order to prevent degradation of printing quality due to overlapping printing of the higher and the lower density inks, an input image signal is converted to an output image signal indicative of one of 'non-printing' 'printing with lower density ink' and 'printing with higher density ink' is generated. More specifically, when printing is performed with two kinds of inks, i.e. the higher density ink and the lower density ink with respect to the same color type inks, the input image signal is subject of conversion process into three level data and two out of three levels are taken as printing signals of a head for ejecting the higher and lower density inks.
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