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A disadvantage is that black ink by itself in a shadow may not be dark enough. In this case CMY colors may be added for more accurate reproduction, this process being under color addition (UCA). UCR is generally not recommended for use in printing due to its tendency to produce dull-looking images and artwork.
The CMYK color model is based on the CMY color model, which omits the black ink. Four-color printing uses black ink in addition to subtractive primaries for several reasons: [2] In traditional preparation of color separations, a red keyline on the black line art marked the outline of solid or tint color areas. In some cases a black keyline was ...
The trap is not visible since the lighter color is spread underneath the—almost—opaque black. For the same reason, in many cases, black ink is set to "overprint" colors in the background, eliminating the more complex process of spreading or choking. Since black is a dark color, white gaps caused by misregistration are more visible.
The colored ink under the black ink makes a "richer" result; the additional inks absorb more light, resulting in a closer approximation of true black. While, in theory, an even richer black can be made by using 100% of each of the four inks, in practice, the amount of non-black ink added is limited by the wetness that the paper and printing ...
Benizuri-e (紅摺り絵, "crimson printed pictures") - images printed in two or three colors, usually containing red and green pigments, as well as black ink. This printing technique should not be confused with "beni-e", above.
In printing, registration black is a black color that includes 100% of each of the process colors used. Typically these are cyan, magenta, yellow and black , [4] but if different colors are used, registration black marks are made with all of the colorants (inks). [4] Registration black is used for printing crop marks and registration marks ...
In inkjet color printing and typical mass production photomechanical printing processes, a black ink K (Key) component is included, resulting in the CMYK color model. The black ink serves to cover unwanted tints in dark areas of the printed image, which result from the imperfect transparency of commercially practical CMY inks; to improve image ...
In printing and graphic arts, mixing of two dissimilar colors in two adjacent printed dots before they dry and absorb in substrate is referred to as color bleeding. [1] Unless it is done for effect, color bleeding reduces print quality. Prior art applied this term to the phenomenon of single color ink following the fibers of the paper. [2]