MACROMEDIA FIREWORKS MX 2004-USING FIREWORKS Use Manual page 246

Removing halos
When you make the canvas color transparent on an image that was previously anti-aliased, the
pixels from the anti-aliasing remain. Then when you export (or in some cases, save) the graphic
and place it on a web page with a different background color, the perimeter pixels of the anti-
aliased object may be apparent on the web page's background. These form a halo, which is
especially noticeable on a dark background.
You can easily prevent halos in native Fireworks PNG files and in imported Photoshop files.
For other file types such as GIF, however, you must remove the halo manually.
To prevent halos in native Fireworks PNG files and imported Photoshop files, do one of
the following:
•
Set the Canvas Color in the Property inspector or the Matte Color in the Optimize panel to
the color of the target web page background.
•
With the object you want to export selected, choose Hard from the Edge pop-up menu in the
Property inspector.
To remove a halo manually from a GIF or other graphic file:
With the file open in Fireworks, click the Preview, 2-Up, or 4-Up button at the upper left of
1
the Document window. In 2-Up or 4-Up view, click a view other than the original.
In the Optimize panel, choose Index Transparency from the Transparency pop-up menu.
2
Click the Add Color to Transparency button and click a pixel in the halo.
3
All pixels of the same color are removed in the preview.
If the halo is still there, repeat step 3 until the halo is gone.
4
Saving and reusing optimization settings
You can save custom optimization settings for future use in optimization or batch processing. The
following information is saved in custom preset optimizations:
•
Settings and color table in the Optimize panel
•
Frame delay settings chosen in the Frames panel (for animations only)
246 Chapter 12: Optimizing and Exporting