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Lesson 16. Optimizing Web Images > Finalizing the Color Table

Finalizing the Color Table

Although it’s not usual to think of transparency as a color, it does count as one of the 32 colors in the Color Table for the image. That means you need to inspect the image one more time to find any unacceptable dithering caused by the shift to transparency.

1.
Scroll, or select the Hand tool () and drag, to examine all the areas of the image.

Notice that there is now heavy dithering in the green around the aspen trees.

2.
Select the optimized version on the right side of the image window.

3.
In the Color option on the Optimize palette, select 128.

4.
Select the Eyedropper tool and click the medium green in the upper right corner of the aspen image.

5.
In the Color Table palette, click the lock icon to lock the color.

6.
In the Optimize palette, select 32 as the number of colors.

7.
Scroll or use the Hand tool () to examine the image one more time, confirming that the image strikes an acceptable balance between dithering and file size. Then choose File > Save.


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