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CHAPTER 3
72
Working with Color
System (Mac OS)
palette, which is based on a uniform sampling of
RGB colors.
System (Windows)
default 8-bit palette, which is based on a uniform
sampling of RGB colors.
Uses the 216 colors that Web browsers,
Web
regardless of platform, use to display images on a
monitor limited to 256 colors. This palette is a
subset of the Mac OS 8-bit palette. Use this option
to avoid browser dither when viewing images on a
monitor display limited to 256 colors.
Uniform
colors from the RGB color cube. For example, if
Photoshop Elements takes 6 evenly spaced color
levels each of red, green, and blue, the combi-
nation 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.
Perceptual
priority to colors for which the human eye has
greater sensitivity.
Selective
Perceptual color table, but favoring broad areas of
color and the preservation of Web colors. This
option usually produces images with the greatest
color integrity.
Adaptive
from the spectrum appearing most commonly in
the image. For example, an RGB image with only
the colors green and blue produces a palette made
primarily of greens and blues. Most images
Uses the Mac OS default 8-bit
Uses the Windows system's
Creates a palette by uniformly sampling
Creates a custom palette by giving
Creates a color table similar to the
Creates a palette by sampling the colors
concentrate colors in particular areas of the
spectrum. To control a palette more precisely, first
select a part of the image containing the colors you
want to emphasize. Photoshop Elements weights
the conversion toward these colors.
Creates a custom palette using the Color
Custom
Table dialog box. Either edit the color table and
save it for later use or click Load to load a previ-
ously created color table. (See "Customizing
indexed color tables" on page 73.) 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
previous conversion, making it easy to convert
several images with the same custom palette.
Number of colors in indexed-color images
For the Uniform, Perceptual, Selective, or Adaptive
palette, you can specify the exact number of colors
to be displayed (up to 256) by entering a value for
Colors. The Colors text box controls only how the
indexed color table is created.
Color inclusion and transparency in
indexed-color images
To specify colors to be included in the indexed
color table or to specify transparency in the image,
choose from the following options:
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