Bedienungsanleitung Adobe Photoshop 7 (Seite 432 von 549) (Englisch)

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Using Help | Contents | Index Back 432

Adobe Photoshop Help Preparing Graphics for the Web

Using Help | Contents | Index Back 432

To select a color reduction algorithm:

Choose an option from the Color Reduction Algorithm pop-up menu (below the ﬁle

format menu in the Optimize panel/palette):

Perceptual Creates a custom color table by giving priority to colors for which the human

eye has greater sensitivity.

Selective Creates a color table similar to the Perceptual color table, but favoring broad

areas of color and the preservation of Web colors. This color table usually produces images

with the greatest color integrity. Selective is the default option.

Adaptive Creates a custom color table by sampling colors from the spectrum appearing

most commonly in the image. For example, an image with only the colors green and blue

produces a color table made primarily of greens and blues. Most images concentrate

colors in particular areas of the spectrum.

Web Uses the standard 216-color color table common to the Windows and Mac OS 8-bit

(256-color) palettes. This option ensures that no browser dither is applied to colors when

the image is displayed using 8-bit color. (This palette is also called the Web-safe palette.)

If your image has fewer colors than the total number speciﬁed in the color palette, unused

colors are removed.

Using the Web palette can create larger ﬁles, and is recommended only when avoiding

browser dither is a high priority.

Custom Preserves the current color table as a ﬁxed palette that does not update with

changes to the image.

Mac OS Uses the Mac OS system’s default 8-bit (256-color) color table, which is based on a

uniform sampling of RGB colors. If your image has fewer colors than the total number

speciﬁed in the color palette, unused colors are removed.

Windows Uses the Windows system’s default 8-bit (256-color) color table, which is based

on a uniform sampling of RGB colors. If your image has fewer colors than the total number

speciﬁed in the color palette, unused colors are removed.

Other color tables appear in the menu if you have saved them previously. (See “

and saving color tables” on page 437.)

You can use an alpha channel to inﬂuence the generation of color tables. (See “

Using

masks to modify color reduction” on page 430.)

To regenerate a color table (ImageReady):

Choose Rebuild Color Table from the Color Table palette menu. Use this command to

generate a new color table when the Auto Regenerate option is off. (See “

Controlling

optimization (ImageReady)” on page 426.)

Changing the display of the color table

You can sort colors in the color table by hue, luminance, or popularity, making it easier to

see an image’s color range and locate particular colors. In ImageReady, you can also

change the size of the color swatches in the color table.

To sort a color table:

Choose a sorting order from the Color Table palette menu:

• Unsorted. Restores the original sorting order.

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