Adobe photoshop elements Benutzerhandbuch

ADOBE PHOTOSHOP ELEMENTS

Provides options to force the inclusion of 

certain colors in the color table. Black and White 
adds a pure black and a pure white to the color 
table; Primaries adds red, green, blue, cyan, 
magenta, yellow, black, and white; Web adds the 
216 Web-safe colors; and Custom lets you define 
custom colors to add.

Specifies whether to preserve trans-

parent areas of the image during conversion. 
Selecting this option adds a special index entry in 
the color table for transparent colors. Deselecting 
this option fills transparent areas with the matte 
color, or with white if no matte color is chosen.

Specifies the background color used to fill 

anti-aliased edges that lie adjacent to transparent 
areas of the image. With Transparency selected, the 
matte is applied to edge areas to help blend the 
edges with a Web background of the same color. 
With Transparency deselected, the matte is applied 
to transparent areas. Choosing None for the matte 
creates hard-edged transparency if Transparency is 
selected; otherwise, all transparent areas are filled 
with 100% white.

Unless you’re using the Exact color table option, 
the color table may not contain all the colors used 
in the image. To simulate colors not in the color 
table, you can dither the colors. Dithering mixes 
the pixels of the available colors to simulate the 
missing colors. 

Choose a dither option from the menu, and enter 
a value for the dither amount. A higher amount 
dithers more colors, but may increase file size. You 
can choose from the following dither options:

Does not dither colors but instead uses the 

color closest to the missing color. This tends to 
result in sharp transitions between shades of color 
in the image, creating a posterized effect.

Uses an error-diffusion method that 

produces a less structured dither than the Pattern 
option. To protect colors in the image that contain 
entries in the color table from being dithered, 
select Preserve Exact Colors. This is useful for 
preserving fine lines and text for Web images. 

Uses a halftone-like square pattern to 

simulate any colors not in the color table.

Helps to reduce seam patterns along the 

edges of image slices. 

The Color Table command lets you make changes 
to the color table of an indexed-color image. 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.

Open the indexed-color image.

Choose Image > Mode > Color Table.

Click or drag in the table to choose the color or 

range of colors you want to change. 

Choose a color, as explained in “Using the 

Adobe Color Picker” on page 77, and click OK.