Справочник Пользователя для Adobe photoshop cs2

ADOBE PHOTOSHOP CS2 

Applies a halftone-like square pattern to determine the value of pixels. 

Applies a random pattern similar to the Diffusion dithering, but without diffusing the pattern across adjacent 

pixels. No seams appear with the Noise algorithm. 

In addition to the following options, you can also adjust the number of colors in the image’s color table. See “Custom­
izing the color table for GIF and PNG-8 images” on page 638. 

Reduces file size by selectively discarding data. A higher Lossy setting results in more data being 

discarded. You can often apply a Lossy value of 5–10, and sometimes up to 50, without degrading the image. The 
Lossy option can reduce file size by 5% to 40%. 

Specifies a method for generating the color lookup table and the number of 

colors you want in the color lookup table. You can select one of the following color reduction methods: 

Creates a custom color table by giving priority to colors for which the human eye has greater sensi­

tivity. 

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. 

Creates a custom color table by sampling colors from the predominant spectrum 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. 

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.) Using the web palette can create larger files, and is recommended 
only when avoiding browser dither is a high priority. 

Uses a color palette that is created or modified by the user. If you open an existing GIF or PNG-8 file, it 

will have a custom color palette.