MACROMEDIA DIRECTOR MX-USING DIRECTOR MX Use Manual page 221

To change the color depth, select an option from the Color Depth pop-up menu.
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For more information about the color depth of bitmap cast members, see "Controlling color"
on page 255.
To change the palette, select a palette from the Palette pop-up menu and select one of the
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following remapping options:
replaces the original colors in the graphic with the most similar solid colors in
Remap Colors
the new palette. This is the preferred option in most cases.
blends the colors in the new palette to approximate the original colors in the graphic.
Dither
256 grays
Remapped to closest colors in black and white
Dithered in black and white
Click Transform to execute the changes.
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The settings you select in the Transform Bitmap dialog box cannot be undone.
Bitmaps 221