Adobe photoshop cs2 사용자 설명서
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ADOBE PHOTOSHOP CS2
User Guide
If you must convert your image from one mode to another, it makes sense to perform most of your tonal and color
corrections in RGB mode and use CMYK mode for fine-tuning. Advantages of working in RGB mode include the
following:
corrections in RGB mode and use CMYK mode for fine-tuning. Advantages of working in RGB mode include the
following:
•
You can save memory and improve performance because you are working with fewer channels.
•
The range of colors in RGB spaces is much larger than the range in CMYK spaces, and more colors are likely to be
preserved after adjustments.
preserved after adjustments.
Using the Proof Setup and Proof Color commands, you can preview composite CMYK colors and separation plates
using the CMYK working space defined in the Color Settings dialog box. Or, you can preview colors using a custom
CMYK color profile.
using the CMYK working space defined in the Color Settings dialog box. Or, you can preview colors using a custom
CMYK color profile.
You can edit an image in RGB mode in one window and view the same image in CMYK colors in another window.
Choose Window > Arrange > New Window For (File Name) to open a second window with the image you’re working
Choose Window > Arrange > New Window For (File Name) to open a second window with the image you’re working
on. Make sure Working CMYK is chosen for Proof Setup and then use the Proof Color command to turn on the CMYK
preview in one of the windows.
preview in one of the windows.
About out-of-gamut colors
A gamut is the range of colors that a color system can display or print. A color that can be displayed in RGB may be
out of gamut, and therefore unprintable, for your CMYK setting.
out of gamut, and therefore unprintable, for your CMYK setting.
Photoshop automatically brings all colors into gamut when you convert an RGB image to CMYK. But you might
want to identify the out-of-gamut colors in an image or correct them manually before converting to CMYK.
want to identify the out-of-gamut colors in an image or correct them manually before converting to CMYK.
In RGB mode, you can tell whether a color is out of gamut in the following ways:
•
In the Info palette, an exclamation point appears next to the CMYK values whenever you move the pointer over
an out-of-gamut color.
an out-of-gamut color.
•
In both the Color Picker and the Color palette, an alert triangle
appears and the closest CMYK equivalent is
displayed whenever you select an out-of-gamut color. To select the CMYK equivalent, click the triangle or the
color patch.
color patch.
•
You can use the Gamut Warning command to search for out-of-gamut colors.
To turn the highlighting of out-of-gamut colors on or off
1
Choose View > Proof Setup, and choose the proof profile on which you want to base the gamut warning.
2
Choose View > Gamut Warning. All pixels outside the gamut of the current proof profile space are highlighted.
To change the gamut warning color
1
Do one of the following:
•
In Windows, choose Edit > Preferences > Transparency & Gamut.
•
In Mac OS, choose Photoshop > Preferences > Transparency & Gamut.
2
Under Gamut Warning, click the color box to display the Color Picker. Then choose a new warning color, and
click OK. For best results, use a color that is not already present in the image.
3
Enter a value in the Opacity text box. Values can range from 0 to 100%. Use this setting to reveal more or less of
the underlying image through the warning color. Then click OK.