1 Select the bitmap with the Pick tool.
2 Click Bitmaps, Contour, Trace Contour.
3 Move the Level slider to set the threshold brightness. Brightness values range from 1 to 255.
4 Click one of the following Edge Type buttons:
• Lower — traces colors with brightness values below the threshold
• Upper — traces colors with brightness values above the threshold
• The Trace Contour effect supports all color modes except 48-bit RGB, 16-bit Grayscale, Paletted, and Black-and-White.
^ • You can also set the threshold level by typing a value in the Level box.
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