Adobe photoshop elements User Manual

CHAPTER 3

Uses the Mac OS default 8-bit 

palette, which is based on a uniform sampling of 
RGB colors.

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 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.

Creates a palette by uniformly sampling 

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.

Creates a custom palette by giving 

priority to colors for which the human eye has 
greater sensitivity.

Creates a color table similar to the 

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.

Creates a palette by sampling the colors 

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 

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 

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 conversion, making it easy to convert 
several images with the same custom palette.

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.

To specify colors to be included in the indexed 
color table or to specify transparency in the image, 
choose from the following options: