Adobe 65011817 User Guide - Page 226

Select a color depth for an 8-bit image, Remove unused colors in an 8-bit image

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USING FIREWORKS CS4 220 Optimizing and exporting Select a color depth for an 8-bit image Color depth is the number of colors in the graphic. Reducing color depth makes a smaller file size, but it can also reduce the image quality. When you reduce color depth, some colors in the image are discarded, beginning with those used least. Pixels containing discarded colors convert to the closest color remaining in the palette. ❖ Do one of the following: • In the Optimize panel, select an option from the Colors pop-up menu. • Type a value (from 2 to 256) in the text box. Note: The number at the bottom of the color table indicates the actual number of colors visible in the image. If no number is visible, click the Rebuild button. Remove unused colors in an 8-bit image This makes the file size smaller. ❖ From the Optimize panel Options menu, select Remove Unused Colors. Include all palette colors, including those not present in the saved image ❖ Deselect Remove Unused Colors. View and edit colors in a palette The color table in the Optimize panel displays colors in the current preview when you are working in 8-bit color or less. You can also modify the palette of an image. The color table updates automatically when you are in Preview mode. It appears empty if you are optimizing more than one slice at a time or if you are not working in 8-bit color. Various small symbols appear on some color swatches, indicating certain characteristics of individual colors, as follows: Symbol Meaning The color has been edited, affecting only the exported document. Editing a color doesn't change the color in the source document. The color is locked. The color is transparent. The color is web-safe. The color has multiple attributes. In this case, the color is web-safe, is locked, and has been edited. Rebuild the color table to reflect edits in the document The Rebuild button appears at the bottom of the Optimize panel when a rebuild is needed. ❖ Click the Rebuild button. Select colors in a palette • To select a single color, click the color in the Optimize panel color table. • To select multiple colors, Control-click (Windows) or Command-click (Mac OS) the colors. Last updated 3/8/2011

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220
USING FIREWORKS CS4
Optimizing and exporting
La
s
t updated 3/8/2011
Select a color depth for an 8-bit image
Color depth
is the number of colors in the graphic. Reducing color depth makes a smaller file size, but it can also reduce
the image quality. When you reduce color depth, some colors in the image are discarded, beginning with those used
least. Pixels containing discarded colors convert to the closest color remaining in the palette.
Do one of the following:
In the Optimize panel, select an option from the Colors pop-up menu.
Type a value (from 2 to 256) in the text box.
Note:
The number at the bottom of the color table indicates the actual number of colors visible in the image. If no
number is visible, click the Rebuild button.
Remove unused colors in an 8-bit image
This makes the file size smaller.
From the Optimize panel Options menu, select Remove Unused Colors.
Include all palette colors, including those not present in the saved image
Deselect Remove Unused Colors.
View and edit colors in a palette
The color table in the Optimize panel displays colors in the current preview when you are working in 8-bit color or
less. You can also modify the palette of an image. The color table updates automatically when you are in Preview mode.
It appears empty if you are optimizing more than one slice at a time or if you are not working in 8-bit color.
Various small symbols appear on some color swatches, indicating certain characteristics of individual colors, as
follows:
Rebuild the color table to reflect edits in the document
The Rebuild button appears at the bottom of the Optimize panel when a rebuild is needed.
Click the Rebuild button.
Select colors in a palette
To select a single color, click the color in the Optimize panel color table.
To select multiple colors, Control-click (Windows) or Command-click (Mac OS) the colors.
Symbol
Meaning
The color has been edited, affecting only the exported document. Editing a color doesn’t change the
color in the source document.
The color is locked.
The color is transparent.
The color is web-safe.
The color has multiple attributes. In this case, the color is web-safe, is locked, and has been edited.