Adobe Photoshop CC 2014 v.14.xx - Manual (Page 205)

Customizing indexed color tables
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Customize indexed color tables
Customize indexed color tables
The Color Table command lets you make changes to the color table of an indexed-color image. These customization features are particularly
useful with pseudocolor images—images displaying variations in gray levels with color rather than shades of gray, often used in scientific and
medical applications. However, customizing the color table can also produce special effects with indexed-color images that have a limited number
of colors.
To shift colors simply in a pseudocolor image, choose Image > Adjustments, and use the color adjustment commands in the submenu.
Edit colors and assign transparency with a color table
You can edit colors in the color table to produce special effects, or assign transparency in the image to a single color in the table.
1. Open the indexed-color image.
2. Choose Image > Mode > Color Table.
3. To change a single color, click the color and choose a new color in the Color Picker.
4. To change a range of colors, drag in the table to choose the range of colors you want to change. In the Color Picker, choose the first color
you want in the range and click OK. When the color picker redisplays, choose the last color you want in the range and click OK.
The colors you selected in the Color Picker are placed in the range you selected in the Color Table dialog box.
5. To assign transparency to a color, select the Eyedropper tool in the Color Table dialog box, and click the color in the table or in the image.
The sampled color is replaced with transparency in the image.
6. Click OK in the Color Table dialog box to apply the new colors to the indexed-color image.
Choose a predefined color table
1. Open the indexed-color image.
2. Do one of the following:
Choose Image > Mode >Color Table.
Choose Image > Mode > Indexed Color. In the Indexed Color dialog box, choose Custom from the Panel pop-up menu. This opens the
Color Table dialog box.
3. In the Color Table dialog box, choose a predefined table from the Table menu.
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