HP Color LaserJet CM4730 Service Manual - Page 626

Manage color Understand color variations The printed output might not match the computer screen, and the colors printed on successive pages might not match. While color variations are inherent in this printing method, they can indicate changes in the printing environment, print media, or MFP components. The following list outlines the major causes of color variations between computers, programs, and output devices. ● Halftone patterns that are produced on monitors and the types of patterns that are used in the print jobs are different and might cause variations in the printed output. ● The printed output differs from the image on the monitor because the monitor and the print media have different reference values of black and white. The monitor screen has charcoal gray for the black level, and the white on the monitor screen is actually blue. Black on the print media is limited only by the fill capability of the printer, and most good-quality paper has a very high white level. In addition, phosphor (used in color monitors) and toner have entirely different spectra characteristics and different color-rendering capabilities. Differences between output are common. Blues generally match better than reds. ● The color of the ambient light changes the perception of color. Fluorescent light lacks many colors that are present in incandescent light, and the color range of natural light is broader than any artificial light. When comparing color, choose a standard light source for reference and understand that the perceived color will change as the light changes. ● Long-term color variations occur as paper ages. Use high-quality paper and protect the paper from sunlight to help minimize discoloration. ● Environmental changes can cause color variation. The development process places a high potential across an air gap to attract toner to the imaging drum. Changes in relative humidity vary the point at which the toner travels to the imaging drum. ● All consumable components have a finite life span. As these components reach the end of their useful life, their ability to produce consistent print quality diminishes. ● Paper roughness can cause colors to look different. Use standard paper. Use color HP ImageREt 3600 HP ImageREt 3600 print technology is a system that HP developed to deliver superior print quality and technological innovation. The HP ImageREt system incorporates technology that optimizes each element of the print system. Several categories of HP ImageREt have been developed that meet a variety of user needs. The system is comprised of key laser technologies for color printing, including image enhancements, smart supplies, and high-resolution imaging. The ImageREt core technologies are refined in higher level systems for more advanced system users, and additional technologies are integrated. The HP ImageREt 3600 is a complete HP proprietary printing solution. HP now offers superior image enhancements for general office and marketing documents. HP ImageREt 3600 performs well in 606 Chapter 6 Problem solving ENWW