Xerox Phaser 7750 Manual de usuario

Phaser® 7750 Color Laser Printer

2-35

Using Color

This topic includes:

■"Printers and CMYK" on page 2-35

■"Monitors and RGB" on page 2-35

■"Image Processing" on page 2-36

■"Adjusting Color Using TekColor Correction" on page 2-36

■"Color Calibration" on page 2-37

■"Paper Calibration" on page 2-38

■"Color Sampler Pages" on page 2-38

Printers and CMYK

Your printer and monitor generate color quite differently. Your printer produces prints using a

series of dots in three primary colors: cyan, magenta, and yellow. When equal amounts of

these three colors are overlaid, the resulting color is black.

The printer can overlay two colors to produce a third color. For example, magenta and yellow

produce red. Cyan and magenta produce blue. To produce less saturated colors the printer

“mixes” white by leaving some dots unprinted. Mixing magenta with unprinted dots produces

pink.

By overlaying two or more primaries, the printer generates a palette of eight colors. Although

equal portions of the three primary colors form black, your printer includes a separate black

toner cartridge to produce very dense black for images with a large amount of black text or

black backgrounds. These four colors—cyan, magenta, yellow, and black—represent the color

system known as CMYK.

Monitors and RGB

Your monitor projects color onto the screen. The three primary colors the monitor projects are

red, green, and blue. When equal portions of these three colors are projected, they produce

white. These three colors represent the color system known as RGB.

The surface of your monitor consists of thousands of phosphor dots. To produce red, the

monitor projects red phosphors. To produce a less saturated hue of red (pink) the monitor turns

on two out of three of the red phosphors. Printers add unprinted white dots to produce less

saturated colors, while monitors turn on fewer phosphors.

Another important difference between your printer and monitor is the way each one translates

light. Paper reflects light, while monitors emit light. Because of these different methods,

printers have one range of colors and monitors have a different range of colors.

Using Color

Phaser® 7750 Color Laser Printer

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Image Processing

The differences between the way your printer and monitor produce color explain why your

printed document can look different from what you see on your screen. To compensate for

these differences, the colors are converted by your printer using image processing. Image

processing is the process of translating your computer file into printer toner. Your printer uses

TekColor Correction to translate color from your computer to your printer.

Adjusting Color Using TekColor Correction

The TekColor correction options provide simulations of different color devices. Automatic is

the default correction for general image processing. See the following table to determine what

option you want to use.

For more information on color matching and ICC profiles, go to www.xerox.com/office/

infoSMART.

Category TekColor Correction Description

Automatic Applies the best color correction to each graphic

element: text, artwork, and photographs.

Office Color sRGB Display Approximates the colors on a computer display.

sRGB Vivid Produces brighter, more saturated colors than sRGB

Display.

Press Match SWOP Press Matches Specifications for Web Offset Publications.

Euroscale Matches FOGRA glossy paper specification.

Commercial Approximates U.S. commercial press target.

SNAP Press Matches Specifications for Newsprint Advertising

Production.

Japan Color Matches Japan Color 2001 specification.

Custom colors Uses a custom color correction developed for your

printer using PhaserMatch software.

None Applies no color correction. Use with other color

management tools, such as ICC (International Color

Consortium) profiles, ColorSync, or the Phaser 7750

PANTONE Color Chart.

Black and White Converts all colors to shades of gray.

User Printer Front

Panel Setting

Uses the color correction set in the printer. The color

correction can be set in the printer using either the

front panel or the CentreWare software (if available).

Using Color

Phaser® 7750 Color Laser Printer

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To select the color correction in a supported driver:

■Windows 98, Windows Me PostScript driver:

On the TekColor tab, select the desired color correction. Some of the color corrections are

grouped under Office Color or Press Match.

■Windows 2000, Windows XP, Windows Server 2003, Windows NT PostScript driver:

On the TekColor tab, select the desired color correction. Some of the color corrections are

grouped under Office Color or Press Match.

■Mac OS 9 driver:

In the Print dialog box, click General, select TekColor from the drop-down list, then

select the desired correction for Color.

■Mac OS X (version 10.1 and higher) driver:

In the Print dialog box, select Image Quality from the drop-down list, then select the

desired color correction option from the Color Correction drop-down list.

Color Calibration

Overview

Color calibration procedures adjust the printer for optimal color output. Color settings may

need adjustment upon initial printer setup or when toners and imaging units are replaced.

There are two procedures: Balance Colors and Lighten/Darken Colors. If a finer adjustment of

the primary colors (cyan, magenta, and yellow) is needed, start with the Balance Colors

procedure. If the overall image appears either too light or dark, use the Lighten/Darken Colors

procedure. For more information on color calibration, print the “Color Calibration”

information page from your printer’s front panel.

For more information on color calibration, print the “Color Calibration” information page

from your printer’s front panel.

To print the “Color Calibration” pages:

1. At the printer’s front panel, select Printer Setup, then press the OK button.

2. Select Calibration Setup, then press the OK button.

3. Select Calibrate Colors, then press the OK button.

4. Select a color calibration option from the list displayed, then press the OK button.

5. Follow the front panel prompts to perform the calibration procedure.

Note

For more information on color matching and International Color Consortium (ICC)

profiles, go to www.xerox.com/office/infoSMART.

Using Color

Phaser® 7750 Color Laser Printer

2-38

Paper Calibration

Paper calibration adjusts the printer for various paper types and environmental conditions. If

you change brands, paper types, or the temperature or humidity changes significantly, then you

may need to readjust the printer.

For more information on paper calibration, print the “Calibrate for Paper” information page

from your printer’s front panel.

To print the “Calibrate for Paper” pages:

1. At the printer’s front panel, select Printer Setup, then press the OK button

2. Select Calibration Setup, then press the OK button.

3. Select Calibrate for Paper, then press the OK button.

4. Select Calibrate for Paper Pages, then press the OK button.

5. Follow the instructions for adjusting toner transfer settings at the printer’s front panel.

Color Sampler Pages

Sampler pages for CMYK and RGB color can be printed at the printer’s front panel. Before

printing the sampler pages, set the front panel settings to match the printer driver’s settings.

This ensures that the colors on the printed sampler pages are accurate.

To set print-quality and TekColor Correction settings at the printer’s front panel:

1. Select Printer Setup, then press the OK button.

2. Select PostScript Setup, then press the OK button

3. Select Print-Quality Mode, then select an option from the list displayed.

4. Select TekColor Correction, then select an option from the list displayed.

To print the “CMYK Sampler Page” or “RGB Sampler Page”:

1. Select Information, then press the OK button.

2. Select Sample Pages, then press the OK button.

3. Select either CMYK Sampler Pages or RGB Sampler Pages, then press the OK

button to print.

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