11-12 GA-1120 Color Management - Toshiba

1-13 Managing color on the GA-1120
Black Overprint
The Black Overprint option lets you specify whether black text—defined as
RGB = 0, 0, 0, or as CMYK = 0%, 0%, 0%, 100%—overprints colored backgrounds.
• On—Black text overprints colored backgrounds, eliminating white gaps and
reducing halo effects or misregistration of colors. Setting Black Overprint to On
automatically activates the Pure Black Text/Graphics option.
• Off—Black text knocks out colored backgrounds.
NOTE: PostScript applications may perform their own black overprint conversions
before sending the print job to the GA-1120.
One example of how you might use this setting is with a page that contains black text
on a light blue background. The background blue color is CMYK = 40%, 30%, 0%,
0% and the black text is CMYK = 0%, 0%, 0%, 100%.
• With Black Overprint On, the final text portions of the page are overprinted, or
combined with the underlying colors. This results in CMYK = 40%, 30%, 0%,
100% for the color used for the text. There is no transition in the cyan and magenta
toners, and the quality of the output is improved since it will not show artifacts near
the edges of the text. The option also works with text defined in the RGB color
space, that is RGB = 0, 0, 0.
• With Black Overprint Off, the border of the text is on an edge that has cyan and
magenta toners on one side (outside the text) and black toner on the other side
(inside the text). This transition may cause visible artifacts because of the practical
limitations of the copier.
NOTE: With the Black Overprint Style option, you can specify whether to overprint
only black text or both black text and graphics (see page 1-4).
Spot Color Matching
The Spot Color Matching option provides automatic matching of spot colors with
their best CMYK equivalents.
• On—The GA-1120 uses a built-in table to generate the closest CMYK matches of
spot colors your copier can produce. (New tables are generated when you add new
output profiles.)
NOTE: Spot colors not included in the built-in table are treated as CMYK.