HP 4550 Service Manual - Page 252
Adjusting color balance
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Note CAUTION Note Some of the PANTONE® colors will not match exactly. There are over 945 PANTONE® colors in the PANTONE® Matching System. These colors were created using sixteen inks on a lithographic printing press. Not all of these colors can be reproduced by a laser color printer because they are out of a laser printer's four-color range. PANTONE® calibrates HP printers to provide the closest match for all the colors we can reproduce and provide the colors closest to those we cannot reproduce. This feature requires the use of the PostScript 3 Emulation printer driver. It utilizes a function in the PostScript language for describing custom colors like PANTONE® that is unique to PostScript and not present in the PCL data stream. PANTONE® colors are used mostly in publishing environments by applications such as QuarkXpress and Adobe InDesign that tend to use PostScript only. Adjusting color balance This printer features automatic color calibration to provide high-quality color output. In situations that require critical color control, you can manually adjust the density balance of the printer's four toner colors. This procedure should only be performed by your network administrator. Performing this procedure changes the color balance of the printer by altering halftones and affects all print jobs. To adjust color balance Step 1: Print a color balance calibration page. The color balance calibration page (shown in Figure 7-7) displays current color settings and provides a record of the printer's initial settings before any adjustments are made. 1 Press [MENU] until CALIBRATION MENU displays. 2 Press [ITEM] until PRINT CALIBRATION PAGE displays. 3 Press [SELECT] to print the color balance calibration page. The page consists of four color bars (cyan, magenta, yellow, and black) and a box containing gray balance circles. The factory default setting for each color is zero. The range of settings is -5 to +5. Adjusting densities using the four color bars provides coarse color balance adjustments. After making these adjustments, you can fine-tune color densities by adjusting the gray balance. (See step 7 for instructions.) 250 Troubleshooting C7085-90921