Adobe 29180155 - Photoshop Elements 4.0 User Manual page 153

• System (Windows) Uses the Windows system's default 8-bit palette, which is based on a uniform sampling of RGB
colors.
Uses the 216 colors that web browsers, regardless of platform, use to display images on a monitor limited to
•
Web
256 colors. Use this option to avoid browser dither when images are viewed on a monitor display limited to 256
colors.
• Creates a palette by uniformly sampling colors from the RGB color cube. For example, if Photoshop
Uniform
Elements takes 6 evenly spaced color levels each of red, green, and blue, the combination produces a uniform palette
of 216 colors (6 cubed = 6 x 6 x 6 = 216). The total number of colors displayed in an image corresponds to the nearest
perfect cube (8, 27, 64, 125, or 216) that is less than the value in the Colors text box.
•
Local or Master Perceptual
greater sensitivity. Local Perceptual applies the palette to individual images; Master Perceptual applies the selected
palette to multiple images (for example, for multimedia production).
•
Local or Master Selective
color and the preservation of web colors. This option usually produces images with the greatest color integrity.
Perceptual applies the palette to individual images; Master Perceptual applies the selected palette to multiple images
(for example, for multimedia production).
•
Local or Master Adaptive
image. For example, an RGB image with only the colors green and blue produces a palette made primarily of greens
and blues. Most images concentrate colors in particular areas of the spectrum. To control a palette more precisely,
first select a part of the image that contains the colors you want to emphasize. Photoshop Elements weights the
conversion toward these colors. Perceptual applies the palette to individual images; Master Perceptual applies the
selected palette to multiple images (for example, for multimedia production).
• Creates a custom palette by using the Color Table dialog box. Either edit the color table and save it for
Custom
later use, or click Load to load a previously created color table. This option also displays the current adaptive palette,
which is useful for previewing the colors most often used in the image.
Uses the custom palette from the previous conversion, making it easy to convert several images with the
•
Previous
same custom palette.
Specifies the number of colors to include in the color table (up to 256) for Uniform, Perceptual, Selective, or
Color
Adaptive palettes.
Provides options to force the inclusion of certain colors in the color table. Black and White adds a pure black
Forced
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 transparent areas of the image during conversion. Selecting this option
Transparency
adds a special index entry in the color table for a transparent color. 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
Matte
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.
Creates a custom palette by giving priority to colors to which the human eye has
Creates a color table similar to the Perceptual color table, but favoring broad areas of
Creates a palette by sampling the colors from the spectrum appearing most often in the
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User Guide
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