HP Z3100 HP Designjet Z3100 Printing Guide - Ability to print saturated red o - Page 3

Availability to print saturated red on HP Designjet Z3100 Photo Printer In general, there are no precise colorimetric meanings associated with color nouns like "red", "green", or "blue". The mapping between color names and real world colors "out there" has been a subject of much study and debate. For an interesting approach to this question, see http://www.hpl.hp.com/personal/Nathan_Moroney/mlcn.html In practice, printer primary ink colors are chosen to maximize the addressable color gamut and smoothness of transitions while minimizing artifacts like graininess, metamerism, bronzing, etc. The RGB primaries known from monitors and the corresponding additive color spaces (e.g. Adobe RGB) are rather different from subtractive RGB inks used in printers like the Z series. Nevertheless, primary ink colors of the Z series were chosen to add especially light chromatic colors, which are where printer gamuts are traditionally lacking, compared to monitor gamuts. The resulting printer gamut 'pushes out' in the direction of the RGB primaries of monitor gamuts, like Adobe RGB, even though in isolation the printer RGB inks look more like what we might normally call orange, (lime) green, and violet. We have made these decisions since we developed the HP Designjet Z Photo Printer series to closely match the monitor's color March 2007 Page 3 of 9