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The contour special effects detect and accentuate the edges of objects. You can adjust the level of edge detection, the type of edges that are detected, as well as the color of the edges that are detected.
The Edge detect effect detects the edges in an image and converts them to lines on a single-color background. You can customize this effect by specifying the intensity of the outline and the background color. The White, Black, or Other button allow you to choose a white, black, or other color for the background, respectively. The Sensitivity slider lets you adjust the intensity of the effect.
The Find edges effect locates edges in an image and lets you convert these edges to soft or solid lines. When you convert edges to soft lines you create a smooth blurred outline. Converting edges to solid lines creates a sharper outline. The Find edges filter is particularly useful for high-contrast images, such as images that contain text.
The Trace contour effect highlights the edges of image elements using a 16-color palette. Trace contour lets you specify which edge pixels are highlighted.
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