Adobe Photoshop CS4 - Manual (Page 130)

123 USING PHOTOSHOP CS4
Color fundamentals
Last updated 1/10/2010
Choose a CMYK equivalent for a non-printable color
Some colors in the RGB, HSB, and Lab color models cannot be printed because they are out-of-gamut and have no
equivalents in the CMYK model. When you choose a non-printable color in either the Adobe Color Picker or the Color
panel, a warning alert triangle appears. A swatch below the triangle displays the closest CMYK equivalent.
Note: In the Color panel, the alert triangle is not available if you are using Web Color Sliders.
❖ To choose the closest CMYK equivalent, click the alert triangle in the Color Picker dialog box or the Color
panel.
Printable colors are determined by the current CMYK working space defined in the Color Settings dialog box.
More Help topics
“ Identify out-of-gamut colors ” on page 164
Choose a spot color
The Adobe Color Picker lets you choose colors from the PANTONE MATCHING SYSTEM®, the Trumatch®
Swatching System™, the Focoltone® Colour System, the Toyo Color Finder™ 1050 system, the ANPA-Color™ system,
the HKS® color system, and the DIC Color Guide.
To ensure that the final printed output is the color you want, consult your printer or service bureau and choose your
color based on a printed color swatch. Manufacturers recommend that you get a new swatch book each year to
compensate for fading inks and other damage.
Important: Photoshop prints spot colors to CMYK (process color) plates in every image mode except Duotone. To print
true spot color plates, create spot color channels.
1 Open the Adobe Color Picker, and click Color Libraries.
The Custom Colors dialog box displays the color closest to the color currently selected in the Adobe Color Picker.
2 For Book, choose a color library. See below for descriptions of the color libraries.
3 Locate the color you want by entering the ink number or by dragging the triangles along the scroll bar.
4 Click the desired color patch in the list.
More Help topics
“ About spot colors ” on page 497
Spot color libraries
The Adobe Color Picker supports the following color systems:
ANPA-COLOR Commonly used for newspaper applications. The ANPA-COLOR ROP Newspaper Color Ink Book
contains samples of the ANPA colors.
DIC Color Guide Commonly used for printing projects in Japan. For more information, contact Dainippon Ink &
Chemicals, Inc., in Tokyo, Japan.
FOCOLTONE Consists of 763 CMYK colors. Focoltone colors help avoid prepress trapping and registration problems
by showing the overprints that make up the colors. A swatch book with specifications for process and spot colors,
overprint charts, and a chip book for marking up layouts are available from Focoltone. For more information, contact
Focoltone International, Ltd., in Stafford, United Kingdom.