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In Windows, choose File > Color Settings >
Monitor Setup.
Note: If you do not see the Gamma control panel on
the Macintosh, locate the Gamma file in the
Goodies > Calibration folder inside the Adobe
Photoshop folder. Drag the Gamma icon into the
Controls Panels folder in the System Folder, and
restart your Macintosh.
5 Click a target gamma at the top of the control
panel (Macintosh), or type a value for Gamma in
the Monitor Setup dialog box (Windows). A target
gamma of 1.8 is recommended for printing CMYK
images, because it closely matches printer dot gain.
If you’re sending your output to an RGB device
(for example, a monitor, film recorder, or RGB
printer), use a higher target. Images intended for
video should have a target gamma of 2.2, which is
the typical gamma of most television sets. If you
plan to print or display the image using another
application or on another platform, use a gamma
of 1.8; that value is the closest match for uncor-rected
gamma.
6 Windows only: If you changed the gamma value
in step 5, click OK; then choose File > Color
Settings > Monitor Setup to reopen the Monitor
Setup dialog box.
7 Windows only: Click Calibrate in the Monitor
Setup dialog box. You can preview the effects of
calibration on an open Photoshop image at any
time by clicking Preview in the Calibrate dialog
box.
8 Hold up a white piece of paper similar in color
to the stock on which you will print. Click White
Pt, and drag the three slider triangles until the
monitor white matches the paper as closely as
possible. This process lets you compensate for the
bluish tint found in most monitor displays.
For maximum accuracy, view the paper under
controlled lighting, such as a light box or a combi-nation
of fluorescent and tungsten light bulbs.
9 Adjust the gamma by dragging the Gamma
Adjustment slider until the solid gray areas match
the patterned gray areas in the gamma strip above
the slider.
10 Adjust the color balance by clicking Balance
and dragging the three slider triangles until the
gray areas in the strip below the sliders become a
neutral gray. This adjustment controls the
monitor’s mixture of red, green, and blue, and it
compensates for color casts in the monitor.
11 Adjust the black point by clicking Black Pt and
dragging the three slider triangles until no color
tint appears in the shadow tones in the lower strip
and you can see a distinct gradation between each
pair of swatches.
87
12 If necessary, readjust the color balance and
then the gamma.
13 When you’ve finished making adjustments,
close the Gamma control panel (Macintosh) or the
Calibrate dialog box (Windows).
14 Save the settings. See “Saving and loading
custom gamma settings” on page 87.
Recalibrating
Once you have calibrated your monitor, you
should not have to recalibrate unless you change
any of the factors affecting calibration. For exam-ple,
if you change the room lighting or readjust the
monitor brightness and contrast controls, you will
need to recalibrate the system. For this reason, it’s
recommended that you tape down your monitor’s
brightness and contrast controls after calibrating
the monitor, and that you maintain consistent
room lighting conditions.
Calibrating multiple monitors
(Macintosh only)
If you are using more than one monitor, you can
drag the Gamma control panel onto the next
screen and repeat the calibration steps for each
monitor. When calibrating multiple monitors, it
can be helpful to open an image with a wide
dynamic range and a good selection of colors. For
example, you can use the Ole No Moire image
located in the Goodies > Calibration > Separation
Sources folder inside the Adobe Photoshop folder.
Create another window for the image by choosing
Window > New Window, and drag the image to
the second monitor. Use the image to determine
when the calibration is correct.
Saving and loading custom
gamma settings
You can save and load custom gamma settings for
paper stocks with different tints. You can also save
gamma settings for different monitors. To reuse
the gamma settings, use the Save Settings and Load
Settings buttons in the Gamma control panel
(Macintosh) or in the Calibrate dialog box (Win-dows).
Step 2: Enter the Monitor Setup
information
Once you have calibrated your monitor, enter your
monitor specifications in the Monitor Setup dia-log
box. Adobe Photoshop uses the information in
the Monitor Setup dialog box to account for fac-tors
affecting the monitor display: the target
gamma and white point, the type of phosphors in
the monitor, and the room lighting conditions.
In addition to affecting the overall monitor dis-play,
the Monitor Setup information is used to
determine how the program converts colors
between modes. This means that Monitor Setup
options will affect how an RGB image is converted
to CMYK mode as well as the on-screen display of
CMYK (or duotone) colors (Macintosh) or RGB
images (Windows). If you change these settings
after you have converted an image to CMYK
mode, only the display is affected. You must revert
to the original RGB image and then reconvert the
image to CMYK for these changes to affect the sep-aration
data. (See “Converting to CMYK” on
page 99.)
CHAPTER 5 88
Reproducing Color
To enter Monitor Setup information:
1 Choose File > Color Settings > Monitor Setup.
2 For Monitor, select the monitor you are
adjusting. If your monitor is not listed as an
option, choose the Default option or contact your
monitor manufacturer to determine which
monitor option you should select for your
monitor to emulate.
3 For Gamma, type a value appropriate for your
platform: On the Macintosh, type the value that you
selected for Target Gamma in the Gamma control
panel. If you are using a third-party utility, enter
the gamma value set by that device. In Windows you should
have already entered a
value here. If not, go back to “Step 1: Calibrate
your monitor” on page 85.
4 For White Point, select a setting.
If you are using a third-party monitor calibration
device, choose the white point value established by
that device; otherwise, leave this value at the
default value of 6500K. If you don’t see the value
you need, select Custom, and type in your own
values.
5 For Phosphors, select a monitor type.
If the correct type is not in the drop-down list,
choose Custom, and enter the red, green, and blue
chromaticity coordinates as specified by your
monitor manufacturer. This option accounts for
the different red, green, and blue phosphors used
by monitors to display color.
6 For Ambient Light, select a setting: Select High if your
room lighting is brighter than
the on-screen image. Because the High setting has
no effect on RGB-to-CMYK conversion, you
should also select High if you are using hardware
monitor calibration that accounts for ambient
lighting. Select Low if your room lighting is not as bright
as the screen. Select Medium if your room and monitor light
levels are about the same.
Remember that it is important to maintain
consistent room lighting.
Saving and loading monitor settings
Use the Save and Load buttons in the Monitor
Setup dialog box to save and load the settings for
different monitors or different lighting environ-ments.
You might also want to save the monitor
settings if you are using different gamma settings
for output devices or if you work with images from
other computers.
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