HP L 5 manual Modifying Output Color Color LaserJet, 5, 5M DeskJet

D Modifying Output Color

(Color LaserJet, 5, 5M,

DeskJet)

Introduction

The previous appendices of this manual have been concerned with giving an overview of the color printing process, choosing color modes, and using palettes. This portion of the manual explains how color can be modified to produce a desired result, from using halftone render algorithms to change the way color is rendered, to compensating for the yellow cast caused by a tungsten light source in a photograph. The HP color printers can modify colors using the following means:

•Halftone render algorithms provide a way to modify images based on a dither cell concept. The algorithm chosen determines how specified colors are “rendered” as dots on the printed page.

•Color lookup tables can remap palette colors to compensate for unwanted color characteristics of input data. For example, if a scanned photograph had a reddish cast, a color lookup table could be used to make the printed image look as if it were taken under a more balanced light source.

•Gamma correction provides a way to adjust for color differences in display monitors.

•The Viewing Illuminant command allows you to vary the xy chromaticity coordinates for the light source under which you will be viewing a printed piece. For example, if the printed document is to be viewed under a tungsten light, the command modifies colors so that they have the correct appearance when illuminated by a tungsten light bulb.

•The Monochrome Print Mode command converts each color to its grayscale equivalent for faster draft printing.

EN Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) D-1