Method for tone reproduction in image forming system
AssigneeMinolta Camera Kabushiki Kaisha
InventorsTadamitsu Uchiyama, Tetsuya Iida
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Abstract
A method for reproduction of a multi-tone color image by combination of chromatic inks of cyan, magenta and yellow together with an achromatic ink of black. In the region of lower tone levels than a prescribed value, the image is formed by the complete under color removal, namely, by the sole use of the achromatic ink. In the region of higher tone levels than the prescribed value, the reproduction of the image is attained by performing the under color removal at a ratio of decrease relative to the rise of the tone levels, namely by causing the chromatic inks to overlap the achromatic ink.
Claims8
A method for forming a multi-tone color image using the inks of the four colors, cyan, magenta, yellow, and black, which method comprises effecting reproduction of an achromatic color component of a recording spot by solely using said black ink where the tone level of the achromatic color component is lower than a prescribed value and by using the inks of the three colors of cyan, magenta, and yellow together with the black ink where said tone level is higher than said prescribed value.
A method for reproduction of a multi-tone color image by combination of chromatic inks of cyan, magenta and yellow, together with an achromatic ink of black, which method comprises effecting said reproduction of said multi-tone color image by performing a complete under color removal in the region of the tone levels of the image lower than a prescribed value and effecting said reproduction of said tone by performing an under color removal at a removal ratio of decrease proportionate to the increase of the tone levels in the region of the tone levels higher than said prescribed value.
Dependencies are inferred from the claim text.