Adobe 38039927 User Guide - Page 271

Adaptive, Web Adaptive, Web 216, Exact, Windows and Macintosh, Grayscale, Black and White, Uniform,

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ADOBE FIREWORKS CS3 266 User Guide Choosing a color palette GIFs and other 8-bit image formats contain a color palette. A color palette is a list of up to 256 colors available to the file. Only colors defined in the color palette appear in the graphic; however, some color palettes contain colors that are not in the graphic. The following palettes are available in Fireworks: Adaptive is a custom palette derived from the actual colors in the document. Adaptive palettes most often produce the highest quality image. Web Adaptive is an adaptive palette in which colors that are close to websafe colors are converted to the closest websafe color. Websafe colors are those that come from the Web 216 palette. Web 216 is a palette of the 216 colors common to both Windows and Macintosh computers. This palette is often called a websafe or browser-safe palette because it produces fairly consistent results in various web browsers on either platform when viewed on 8-bit monitors. Exact contains the exact colors used in the image. Only images containing 256 or fewer colors may use the Exact palette. If the image contains more than 256 colors, the palette switches to Adaptive. Windows and Macintosh each contain the 256 colors defined by the Windows or Macintosh platform standards, respectively. Grayscale is a palette of 256 or fewer shades of gray. Choosing this palette converts the image to grayscale. Black and White is a two-color palette consisting only of black and white. Uniform is a mathematical palette based on RGB pixel values. Custom is a palette that has been modified or loaded from an external palette (ACT file) or a GIF file. Adjusting the color palette during optimization affects the colors in the image. You can optimize and customize color palettes using the color table in the Optimize panel. To select a color palette: ❖ Select an option from the Indexed Palette pop-up menu in the Optimize panel. To import a custom palette: 1 Do one of the following: • Select Load Palette from the Optimize panel Options menu. • Select Custom from the Optimize panel Indexed Palette pop-up menu. 2 Navigate to an ACT or GIF palette file and click Open. The colors from the ACT or GIF file are added to the color table in the Optimize panel. Note: Windows users must select GIF Files from the Files of Type pop-up menu to see files with a .gif extension in the Open dialog box. Setting the color depth Color depth is the number of colors in the graphic. You can make your files smaller by reducing the number of colors they use. Reducing color depth discards some colors in the image, beginning with those used least. Pixels containing discarded colors convert to the closest color remaining in the palette. This can reduce the quality of the image. Note: The color depth option is available only for GIFs and other 8-bit graphic file formats.

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ADOBE FIREWORKS CS3
User Guide
266
Choosing a color palette
GIFs and other 8-bit image formats contain a color palette. A color palette is a list of up to 256 colors available to the
file. Only colors defined in the color palette appear in the graphic; however, some color palettes contain colors that
are not in the graphic.
The following palettes are available in Fireworks:
Adaptive
is a custom palette derived from the actual colors in the document. Adaptive palettes most often produce
the highest quality image.
Web Adaptive
is an adaptive palette in which colors that are close to websafe colors are converted to the closest
websafe color. Websafe colors are those that come from the Web 216 palette.
Web 216
is a palette of the 216 colors common to both Windows and Macintosh computers. This palette is often
called a websafe or browser-safe palette because it produces fairly consistent results in various web browsers on either
platform when viewed on 8-bit monitors.
Exact
contains the exact colors used in the image. Only images containing 256 or fewer colors may use the Exact
palette. If the image contains more than 256 colors, the palette switches to Adaptive.
Windows and Macintosh
each contain the 256 colors defined by the Windows or Macintosh platform standards,
respectively.
Grayscale
is a palette of 256 or fewer shades of gray. Choosing this palette converts the image to grayscale.
Black and White
is a two-color palette consisting only of black and white.
Uniform
is a mathematical palette based on RGB pixel values.
Custom
is a palette that has been modified or loaded from an external palette (ACT file) or a GIF file.
Adjusting the color palette during optimization affects the colors in the image. You can optimize and customize color
palettes using the color table in the Optimize panel.
To select a color palette:
Select an option from the Indexed Palette pop-up menu in the Optimize panel.
To import a custom palette:
1
Do one of the following:
Select Load Palette from the Optimize panel Options menu.
Select Custom from the Optimize panel Indexed Palette pop-up menu.
2
Navigate to an ACT or GIF palette file and click Open.
The colors from the ACT or GIF file are added to the color table in the Optimize panel.
Note:
Windows users must select GIF Files from the Files of Type pop-up menu to see files with a .gif extension in the
Open dialog box.
Setting the color depth
Color depth is the number of colors in the graphic. You can make your files smaller by reducing the number of colors
they use. Reducing color depth discards some colors in the image, beginning with those used least. Pixels containing
discarded colors convert to the closest color remaining in the palette. This can reduce the quality of the image.
Note:
The color depth option is available only for GIFs and other 8-bit graphic file formats.