Adobe Flash Professional CS3 Manuale Utente Scaricare il pdf (Pagina 434)

FLASH CS3

User Guide

428

Alpha Sets partial transparency. Enter a Threshold value between 0 and 255. A lower value results in greater trans-

parency. A value of 128 corresponds to 50% transparency.

6 To specify how pixels of available colors are combined to simulate colors not available in the current palette, select

a Dither option. Dithering can improve color quality, but it increases the file size.

None Turns off dithering and replaces colors not in the basic color table with the solid color from the table that most

closely approximates the specified color. Turning dithering off can result in smaller files but unsatisfactory colors.

Ordered Provides good-quality dithering with the smallest increase in file size.

Diffusion Provides the best-quality dithering but increases file size and processing time. Works only with the web

216-color palette selected.

7 To define the image’s color palette, select one of the following Palette types:

Web 216 uses the standard 216-color, web-safe palette to create the GIF image, for good image quality and the fastest

processing on the server.

Adaptive analyzes the colors in the image and creates a unique color table for the selected GIF file. Best for systems

displaying thousands or millions of colors; it creates the most accurate color for the image but increases file size. To

reduce the size of a GIF file with an adaptive palette, use the Max Colors option to decrease the number of colors in

the palette.

Web Snap Adaptive is the same as the Adaptive palette option except it converts similar colors to the web 216-color

palette. The resulting color palette is optimized for the image, but when possible, Flash uses colors from the web 216-

color palette. This produces better colors for the image when the web 216-color palette is active on a 256-color

system.

Custom specifies a palette that you optimized for the selected image. The custom palette is processed at the same

speed as the web 216-color palette. To use this option, know how to create and use custom palettes. To select a custom

palette, click the Palette folder icon (the folder icon that appears at the end of the Palette text field), and select a

palette file. Flash supports palettes saved in the ACT format, that some graphics applications export.

8 To set the number of colors used in the GIF image, if you selected the Adaptive or Web Snap Adaptive palette,

enter a value for Max Colors. A smaller number of colors can produce a smaller file but can degrade the colors in the

image.

9 Click OK.

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Adobe Flash Professional CS3 Manuale Utente Pagina 434