Adobe photoshop cs2 Manual Do Utilizador

ADOBE PHOTOSHOP CS2 

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 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 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 

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. Adobe Photoshop still treats the image as an 8-bit, 256-color image. 

To specify colors to be included in the indexed color table or to specify trans­

parency in the image, choose from the following options: 

Provides options to force the inclusion of certain colors in the color table. Black And White adds a pure 

black 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 adds a special index entry in the color table for transparent colors. 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 

image. When Transparency is selected, the matte is applied to edge areas to help blend the edges with a web 
background of the same color. When Transparency is 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. The image must have transparency for the Matte options to be available. 

Unless you’re using the Exact color table option, the color table may not contain all the colors used in the 

image. To simulate colors not in the color table, you can dither the colors. Dithering mixes the pixels of the available 
colors to simulate the missing colors. Choose a dither option from the menu, and enter a percentage value for the 
dither amount. A higher amount dithers more colors but may increase file size. You can choose from the following 
dither options: 

Does not dither colors but instead uses the color closest to the missing color. This tends to result in sharp 

transitions between shades of color in the image, creating a posterized effect. 

Uses an error-diffusion method that produces a less structured dither than the Pattern option. To 

protect colors in the image that contain entries in the color table from being dithered, select Preserve Exact Colors. 
This is useful for preserving fine lines and text for web images. 

Uses a halftone-like square pattern to simulate any colors not in the color table. 

Helps to reduce seam patterns along the edges of image slices. Choose this option if you plan to slice the 

image for placement in an HTML table.