Adobe PHOTOSHOP 5.0 User Manual page 83

Manipulating the color table
You can change one or more colors in the color
table of an indexed-color image, edit colors to
produce special effects, model the colors after a
predefined color table, and save a color table for
reuse with other indexed-color images.
Another type of image with fewer than 256 colors
is a pseudocolor image—a grayscale image
displaying variations in gray levels with color
rather than shades of gray, and often used in scien-
tific and medical applications. The color table-
editing features are particularly useful with
pseudocolor images, but can also produce special
effects with indexed-color images having a limited
number of colors.
Note: Simply to change colors in an image, choose
Image > Adjust, and use the color correction
commands in the submenus. (See Chapter 6,
Making Color and Tonal Adjustments, for a
description of these commands.)
To edit colors in the color table:
Open the indexed-color image.
1
Choose Image > Mode > Color Table.
2
Click or drag in the table to choose the color or
3
range of colors you want to change.
Choose the color you want, as explained in
4
"Using the Adobe Photoshop Color Picker" on
page 218, and click OK.
If you are changing a range of colors, Photoshop
creates a gradient in the color table between the
starting and ending colors. The first color you
choose in the Color Picker is the beginning color
for the range. When you click OK, the Color Picker
reappears so that you can choose the last color in
the range.
The colors you selected in the Color Picker are
placed in the range you selected in the Color Table
dialog box.
5 Click OK in the Color Table dialog box to apply
the new colors to the indexed-color image.
Choosing a color-table option
Your indexed color table can be modeled after
predefined color tables, which you select from the
Table menu in the Color Table dialog box.
Creates a palette you specify.
Custom
Black Body Displays a palette based on the
different colors a blackbody radiator emits as it is
heated—from black to red, orange, yellow, and
white.
Displays a palette based on 256 levels of
Grayscale
gray—from black to white.
Spectrum Displays a palette based on the colors
produced as white light passes through a prism—
from violet, blue, and green to yellow, orange,
and red.
Displays the standard Windows
Windows System
256-color system palette.
Macintosh System Displays the standard Mac OS
256-color system palette.
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