Tài iệu Photoshop cs5 by Dayley part 124 ppsx

Chapter 29: Printing and Color Management
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Conversion Options: The Engine, Intent, Use Black Point Compensation, and Use Dither
options were discussed earlier in this chapter. The Flatten Image to Preserve Appearance
option is provided to overcome the problem of blending layers. The problem with blending
layers is that converting the layers individually and then flattening results in a different
pixel color than flattening first and then converting. This can be a tough choice if you are
relying on using the layers later.
FIGURE 29.7
Using the Edit ➪ Convert to Profile option, you can use the currently embedded color profile in an image
to convert the image to another color profile and embed that color profile.
Proofing images using color management
In addition to embedding color profiles in images and setting the working color management set-
tings, Photoshop provides quick proofing of images to see how they will appear in some of the
common color profiles. This process is known as soft proofing.
To set up the proofing color space, select View ➪ Proof Setup and then select the color space from
the main menu. The selected color space is used when proofing. Selecting View ➪ Proof Setup ➪
Custom displays the Customize Proof Condition dialog box, shown in Figure 29.8, where you can
set the following customized color proofing options:
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Device to Simulate: This allows you to select the color or device profile to use when
proofing the colors in the image.
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Preserve RGB/CYMK Numbers: When this option is selected, the colors appear without
being converted to the color space of the specified output device.
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Rendering Intent: See the Color Settings section earlier in this chapter for a description.

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Black Point Compensation: See the Black Point Compensation section earlier in this
chapter for a description.
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Simulate Paper Color: If you select a CYMK-based device profile, this option simulates
the slightly off-white property of actual paper according to the settings in the color profile.
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Simulate Black Ink: If you select a CYMK-based device profile, this option simulates the
dark gray that the color profile specifies represents solid black.
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Load/Save: The Load and Save buttons allow you to load and save the custom proof
settings.
FIGURE 29.8
Configuring custom proof condition allows you to proof images in some of the common color profiles.
After you have set up the proofing profile, you can proof the current image by selecting View ➪
Proof Colors from the main menu. The setting specified in the Proof Settings menu is used to dis-
play the image in the colors that match the output device. This is a great way to work in one color
space but still see the results in another.
A useful aspect of Photoshop’s proofing option is the ability to preview items using the Color
Blindness options from the View ➪ Proof Settings menu. Many governments and other institutions
now require common Web sites to use these profiles when displaying images. Even if you are not
embedding one of these profiles in the image, you can use the proofing option to view what the
image will look like if these profiles are used.
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Printing Images from Photoshop
Printing Images from Photoshop can be as simple as pressing Ctrl/Ô+Alt/Option+Shift+P to print a
single copy using the configured print settings. Photoshop also provides much more control over
printing of images by pressing Ctrl/Ô+P to load the Print dialog box, shown in Figure 29.9. The

Print dialog box allows you to set up printing options, implement color management, access the
printer settings, and add additional output to the printed image.
FIGURE 29.9
When printing in Photoshop using the Print dialog box, you can set print size and orientation and use
color management to ensure that the colors printed match those you saw when editing the image.
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Configuring general printing options
The Print dialog box has the following general printing options that allow you to control the
orientation, size, and location of the printed image, as well as the printer settings:
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Preview: The preview window displays the image and its general location on the printed
sheet of paper. The size of the paper also is displayed above the preview. The size of the
paper is controlled by the printer settings dialog box.
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Printer: This allows you to select the printer from the list of installed system printers.
This option also displays a notification that the printer needs calibration if it has not been
calibrated already. You should calibrate the printer before printing from Photoshop so the
output provides the best results.
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Copies: This sets the number of copies to print.
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Print Settings: This launches the settings dialog box for the print driver. The settings
dialog box for the printer likely gives you even more control over things such as paper
size, paper type, print quality, and so on.
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Orientation: The orientation buttons allow you to switch between landscape and portrait
layout when printing the image.
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Position: Using the Center Image option centers the image in the printable area on the
printer. If the Center Image option is not selected, the Top and Left fields specify the
relative position of the top-left corner of the image to the top-left corner of the printable
area of the paper.
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Scaled Print Size: This option allows you to scale the size of the image so it fits on the
printed area perfectly. The scale specifies the size percentage where 100% is the original
size. The Height and Width specify the height and width of the printed image. Selecting
the Scale to Fit Media option disables the Scale, Height, and Width options, and the image
is sized automatically to the same size as the printable area.
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Bounding Box: When this is selected, a black box is added around the edges of the image.
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Units: This sets the units used for the Position and Scaled Print Size options.
Using color management to print accurate colors
The most important aspect of color management is the ability to keep the output colors consistent
with the colors seen when editing the image. Therefore, printing with color management is an
extremely important part of Photoshop. Two options are available to use color management when
printing from Photoshop: Let Photoshop manage the colors, or let the printer manage the colors.
Caution
When you use Photoshop for color management, you need to disable color management in the printer driver.
This varies from driver to driver, so you need to look in the printer manual to find out how to do this.
Conversely, if you are using the printer to manage color profiles, you must enable color management in the
printer driver. If either of these steps is ignored, the printer will print the wrong set of colors. n
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Using Photoshop to manage the colors means that Photoshop sends the color data to the printer
already converted to the appropriate device color profile gamut. For accurate results, this requires
a good ICC profile that defines the color space for the printer.

Using the printer to manage colors means that Photoshop sends the printer the necessary color
profile information for the current values in the image and the printer converts the image data to
the appropriate gamut.
To print an image using color management, make sure the color management settings have been
configured properly and press Ctrl/Ô+P to load the Print dialog box (refer to Figure 29.9). Select
Color Management in the upper-left corner, and configure the following options:
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Document: This uses the embedded color profile in the document or the working color
profile configured in the Color Settings if no profile is present.
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Proof: If this option is selected instead of the Document option, Photoshop emulates
output from a different device than the current printer. This is known as a hard proof.
Hard proofs are useful to test the output on less expensive devices before sending the
output to a high-quality printer. You need to set up proofing using View ➪ Proof
Setup ➪ Custom to set up the device you want to emulate.
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Color Handling: This allows you to select either Printer Manages Colors to use the printer
for color management, Photoshop Manages Colors to use Photoshop for color management,
or Color Separations (if the color model of the image is CYMK) to print a set of color
separations or spot plates using the actual color values.
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Printer Profile: This specifies the ICC color profile to use for the destination device.
When you select the Photoshop Manages Colors option, this setting defines the color profile
that Photoshop uses as the destination color profile when preparing the image to print.
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Rendering Intent: This specifies how Photoshop converts colors from the document’s
gamut to the printer’s gamut. When printing photos, you likely want to use Perceptual or
Relative Colorimetric. See the conversion options section earlier in this chapter for more
details on the available options.
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Proof Setup: This allows you to select either the current working color profile or the
custom profile defined by View ➪ Proof Setup ➪ Custom.
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Simulate Paper Color: If you select a CYMK-based device profile, this option simulates
the slightly off-white property of actual paper according to the settings in the color profile.
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Simulate Black Ink: If you select a CYMK-based device profile, this option simulates the
dark gray that the color profile specifies represents solid black.
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Match Print Colors: This causes the print preview to show the colors as they will actually
print. This is available only if Photoshop is used for color management.
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Gamut Warning: When Match Print Colors is enabled, colors that are out of gamut in the
image are highlighted in the preview option. This is extremely useful for determining the
amount of color translation that must take place to print the image using the printer color
profile. This is available only if Photoshop is used for color management and Match Print
Colors is selected.
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Show Paper White: This displays the paper portion of the print preview to the color of
white specified by the printer color profile. This gives you the most real-life preview of the
printed area because paper is really off-white and can change the color cast of the image.
This is available only if Photoshop is used for color management.
Adding crop marks and additional
output to printed images
Photoshop allows you to print additional information with your images, such as calibration bars,
crop marks, and registration marks. To control the additional output options when printing the
image, select the Output option in the upper-right corner of the Print dialog box shown in Figure

29.10 and then configure the following options:
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Calibration Bars: This option adds an 11-step grayscale transition bar that can be used to
determine the printer calibration. If you are printing color separations, a gradient tint bar
is printed on the left and a color bar is printed on the right.
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Registration Marks: This option adds registration marks on the corners of the image.
Registration marks are usually used only to align color separations.
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Corner Crop Marks: This option adds corner crop marks to the printed images so you
can easily trim the printed document.
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Center Crop Marks: This option adds center crop marks to the printed image to aid in
trimming the edges from the paper.
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Description: This option prints the description contained in the file. You can add a
description by selecting File ➪ File Info from the main menu.
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Labels: This option prints the filename above the image. When printing color separations,
the separation name is printed as part of the label.
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Emulsion Down: This option prints the image backward so text is readable when the
emulsion is down—in other words, when the printed side of the paper is facing away
from you. Typically, this is used only for printing images on film.
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Negative: This option prints a color negative of the image, including all masks and
background colors. This is a bit different that using Image ➪ Adjustments ➪ Invert to
create a negative because it converts the output and not the onscreen image.
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Interpolation: This option is used when printing low-res images. Interpolation reduces

the jagged edges in the low-res image.
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Print Vector Data: If you are printing an image with vector data, such as shapes or text,
select this option to send the vector data to a PostScript printer rather than the raster data.
This enables the printer to print much crisper images.
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Background: This option allows you to specify the background color to be printed in the
printable area outside of the image. For most images, the background color should be
white or possibly black.
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Border: This option launches a dialog box that allows you to set the size of a black border
that is printed around the image. The default size is 0, which means no border.
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Bleed: This option launches a dialog box that allows you to set the position of the crop
marks in relation to the actual edge of the printed image. This has the effect of allowing
space for ink to bleed into the paper without losing full quality around the edges.
FIGURE 29.10
When printing in Photoshop, use the Print dialog to add crop marks, registration marks, calibration bars,
and other additional output to the printed image. You also can control the output form of the image by
printing negative, emulsion down, and vector data.
Description
Calibration bar
Registration mark
Labels
Corner crop
mark
Center crop

mark
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Summary
This chapter discussed using color management to keep colors consistent in your images from
device to device. Color is one of the most important aspects in digital images and one of the most
difficult things to get right when transferring images between systems or printing them.
Color management provides a means to keep colors consistent between devices by using profiles
that define the color gamut in each device. These color profiles are then used to convert the color
values in an image as it is transferred from device to device.
In this chapter, you learned the following:
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ICC color profiles define the color gamut of a device and can be used to accurately convert
color data in images between devices.
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Color profiles can be embedded in images when you save them in Photoshop.
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Calibrating your monitor can ensure that the colors you see in Photoshop are consistent.
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How to configure color management in Photoshop.
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How to convert and image from one color profile to another without losing color
consistency.
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How to proof images for different devices in Photoshop.
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Additional output such as crop marks and calibration bars can easily be added to images.
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Sending vector data to the printer results in crisper print of vector shapes and text.

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Using color management when printing images from Photoshop helps you ensure
consistency of color in the printed image.
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