Adobe GOLIVE CS2 User Manual page 381

To customize the color table for GIF and PNG-8 images
You use the Color Table palette in the Save For Web dialog box to customize the colors in optimized GIF and PNG­
8 images. With a maximum of 256 colors, you can add and delete colors in the color table, shift selected colors to
web-safe colors, and lock selected colors to prevent them from being dropped from the palette.
To add new colors to the color table, select the Eyedropper tool, and click a color in the image. (Alternatively, click
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the color selection box, and use the color picker to select a color.) Then, click the New Color button
Color Table palette. A small white square with a dark center appears in the lower right corner of the new color,
indicating that the color is locked.
Note: If the color table already contains the maximum number of colors (256, or 255 with transparency), you cannot
add a new color.
To change a color in the color table, double-click it. A small plus sign appears in the center of each edited color.
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To delete a color from the color table, select the color and click the Delete button. When you delete a color, areas
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of the optimized image that previously included that color are re-rendered using the closest color remaining in the
palette. Deleting a color changes the color palette type to Custom to prevent the color from being added back to
the palette if you reoptimize the image.
To shift a color to a web-safe color, select the color and click the Web Shift button
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appears in the center of selected colors that have been web-shifted (and in all web-safe colors). To restore a shifted
color to its original value, click the Web Shift button again. Alternatively, select Shift/Unshift Selected Colors
To/From Web Palette or Unshift All Colors from the Color Table palette menu. To specify a tolerance for shifting
colors, specify a value for Web Snap in the Settings section of the Save For Web dialog box. A higher value shifts
more colors.
To lock a color so that it won't be dropped from the color table if you reduce the number, select the color and click
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the Lock button . A white square with a red center appears in the lower right corner of each locked color. To
unlock a color, click the Lock button again. To unlock all colors, select Unlock All Colors from the Color Table
palette menu.
• To select multiple colors in the color table, press Shift and click another color. All colors in the rows between the
first and second selected colors are selected. To select a nonadjacent group of colors, press Ctrl (Windows) or
Command (Mac OS) and click each color that you want to select. The Color Table palette menu also provides
commands for selecting colors.
To sort the colors in the color table, select a sorting command from the Color Table palette menu
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colors by hue (neutral colors are assigned a hue of 0 and located with the reds), luminance (the lightness or
brightness of a color), or popularity, making it easier to see an image's color range and locate particular colors.
To save a color table, select Save Color Table from the Color Table palette menu. By default, the color table file is
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given the extension .act (for Adobe Color Table).
• To load a color table, select Load Color Table from the Color Table palette menu. You can load a color table from
an .act file or a GIF file (to load the file's embedded color table). Once you load a new color table, the colors in the
optimized image change to reflect the new color table.
See also
"To optimize and save web graphics" on page 365
"Comparing web graphics formats" on page 369
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