automatic black
replacement
hp designjet
5500 series
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A six-color printer with light colorants (a CMYKcm configuration) is
unbalanced in the sense that the darkest ink, K, does not have a light
counterpart like the C and M inks. As a result, K ink must not be used in
highlighted image areas, to prevent a grainy appearance. For printers with
an RGB-only interface, the use of K inks can be controlled through the color
map. For Graphic Arts printers that provide a device color CMYK interface this
is not possible, since device colors do not pass through color maps and the
input is preseparated: that is, it already contains a K component. Automatic
Black Replacement solves this problem by using a direct CMYK-to-CMYK
transform inserted in the device color path. It substitutes color inks for black
in the highlights and midtones, while maintaining pure device colors and not
affecting any color that does not contain black.
If you use your HP Designjet printer in an environment where a sharp, black
image is important (prepress proofing, for example), turn OFF the Automatic
Black Replacement button, and the printer will use the black ink supply to
image black.
© 2002 hewlett-packard company
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