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Adobe Illustrator Help
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To set options for exporting CSS layers:
1 Click the Layers tab in the Save for Web dialog box.
2 Select Export As CSS Layers.
3 Choose a layer from the Layer pop-up menu, and set the following options as desired:
Visible to create a visible CSS layer in the resulting HTML file.
•
Hidden to create a hidden CSS layer in the resulting HTML file.
•
Do Not Export to not export the layer to the resulting HTML file.
•
Optimizing colors in GIF and PNG-8 images
Decreasing the number of colors in an image is a key factor in optimizing GIF and PNG-8
images. A reduced range of colors will often preserve good image quality while dramati-
cally reducing the file space required to store extra colors.
Generating a color table
Illustrator generates a color table for GIF and PNG-8 images based on the color options
you set for optimization. You choose a method for generating the color table from the
Color Reduction menu and specify the number of colors you want in the color table in the
Colors text box. (See "Optimization options for GIF and PNG-8 formats" on page
You can choose from the following methods for generating color tables:
Perceptual Creates a custom color table by giving priority to colors for which the human
eye has greater sensitivity.
Selective Creates a color table similar to the Perceptual color table, but favoring broad
areas of color and the preservation of Web colors. This color table usually produces images
with the greatest color integrity. Selective is the default option.
Adaptive Creates a custom color table by sampling colors from the spectrum appearing
most commonly in the image. For example, an image with only the colors green and blue
produces a color table made primarily of greens and blues. Most images concentrate
colors in particular areas of the spectrum.
Web Uses the standard 216-color color table common to the Windows and Mac OS 8-bit
(256-color) palettes. This option ensures that no browser dither is applied to colors when
the image is displayed using 8-bit color. (This palette is also called the Web-safe palette.)
Using the Web palette can create larger files, and is recommended only when avoiding
browser dither is a high priority.
Custom Preserves the current perceptual, selective, or adaptive color table as a fixed
palette that does not update with changes to the image.
Note: Other color tables appear in the menu if you have saved them previously.
Using the Color Table palette
The Color Table palette in the Save for Web dialog box gives you precise control over
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.
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