Important! These effects work on grayscale and 16 million–color (24-bit) images only. For more information about increasing the color depth of an image, see Increasing the color depth of an image.
| Dilate |
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The Dilate effect enhances the light areas of an image or selection. You can apply the Dilate effect by choosing Effects 
Edge Effects Dilate.
| Enhance |
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The Enhance effect increases the contrast along the edges in an image. You can apply the Enhance effect by choosing Effects Edge Effects Enhance.
| Enhance More |
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The Enhance More effect applies a stronger contrast to the edges in an image than the Enhance effect does. You can apply the Enhance More effect by choosing Effects Edge Effects Enhance More.
| Erode |
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The Erode effect enhances the dark areas in an image. You can apply the Erode effect box by choosing Effects Edge Effects Erode.
| Find All |
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The Find All effect enhances the contrast between light and dark in an image by darkening the image and then highlighting the edges. You can apply the Find All Edges effect by choosing Effects Edge Effects Find All.
| Find Horizontal |
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The Find Horizontal effect enhances the contrast between light and dark in an image by darkening the image and then highlighting the horizontal edges. You can apply the Find Horizontal edges by choosing Effects Edge Effects Find Horizontal.
| Find Vertical |
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The Find Vertical effect enhances the contrast between light and dark in an image by darkening the image and then highlighting the vertical edges. You can apply the Find Vertical edges effect by choosing Effects Edge Effects Find Vertical.
| High Pass |
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The High Pass dialog box contains the following controls:
| • | Radius — sets the radius of the blur effect as a percentage |
| • | Desaturate — removes all color, leaving a gray result. The results of the High Pass effect are close to monochrome, even when this check box is unmarked. You can mark this check box, however, to prevent subtle color shifts that can occur when sharpening is applied to an image. This option works by removing any color artifacts that remain after sharpening. |
| Trace Contour |
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The Trace Contour effect traces a series of single-pixel lines around areas of contrast and turns the remaining pixels white. You can apply the Trace Contour effect by choosing Effects Edge Effects Trace Contour.
