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  2. CMYK color model - Wikipedia

    en.wikipedia.org/wiki/CMYK_color_model

    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 ...

  3. Printing registration - Wikipedia

    en.wikipedia.org/wiki/Printing_registration

    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 ...

  4. Specifications for Web Offset Publications - Wikipedia

    en.wikipedia.org/wiki/Specifications_for_Web...

    Comparison of some RGB and CMYK colour gamuts on a CIE 1931 xy chromaticity diagram. Specifications for Web Offset Publications, invariably abbreviated to SWOP, is an organization and the name of a set of specifications that it produces, with the aim of improving the consistency and quality of professionally printed material in the United States, and of certain other products, programs and ...

  5. Spot color - Wikipedia

    en.wikipedia.org/wiki/Spot_color

    Printing Russian 5,000 ₽ banknotes with a metallic spot color. In offset printing, a spot color or solid color is any color generated by an ink (pure or mixed) that is printed using a single run, whereas a process color is produced by printing a series of dots of different colors. [1]

  6. Trap (printing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(printing)

    The same approach applies if one of the colors is a spot color and the other a process color. Trapping becomes more difficult if both colors are process colors and each is to be printed as a combination of the basic printing colors cyan, magenta, yellow and black. In this case, the trapping decision depends on the amount of ‘common’ color.

  7. Color printing - Wikipedia

    en.wikipedia.org/wiki/Color_printing

    A method of full-color printing is six-color process printing (for example, Pantone's Hexachrome system) which adds orange and green to the traditional CMYK inks for a larger and more vibrant gamut, or color range. However, such alternate color systems still rely on color separation, halftoning and lithography to produce printed images.

  8. Gang run printing - Wikipedia

    en.wikipedia.org/wiki/Gang_run_printing

    Gang-run printing describes a printing method in which multiple printing projects are placed on a common paper sheet in an effort to reduce printing costs and paper waste. [1] [2] [3] Gang runs are generally used with sheet-fed printing presses and CMYK process color jobs, which require four separate plates that are loaded into the press.

  9. Under color removal - Wikipedia

    en.wikipedia.org/wiki/Under_color_removal

    In printing, under color removal (UCR) is a process of eliminating overlapping yellow, magenta, and cyan that would have added to a dark neutral (black) and leaving the black ink only, called a full black, during the color separation process. Under color removal is used in process color printing.