Sharpen filters Sharpen filters increase the contrast between adjacent pixels, which can make an image appear more distinct. These commands work with all image modes except Black & White, Indexed, and Duotone. •   The Sharpen filter modifies an image slightly. The effect of the Sharpen More filter is about four times greater. •   The Sharpen Edges filter affects only high-contrast areas. •   The Unsharp Mask filter provides additional control over the sharpening effect. To sharpen an image 1 Select one or more paint objects to sharpen. You can select an area in one image to sharpen the selected area only. 2 Choose Image > Filter > Sharpen, and then choose a filter from the Sharpen submenu. To apply the Unsharp Mask filter 1 Select one or more paint objects to sharpen. You can select an area in one image to sharpen the selected area only. 2 Choose Image > Filter > Sharpen > Unsharp Mask. 3 Enter 1 to 500 percent for Amount. Enter less than 100 percent to sharpen the image slightly. 4 Enter 0.1 to 250 pixels for Radius. This is the size of the area used to determine new color values for the original pixels. Smaller values focus the sharpening effect on high-contrast edges. 5 Enter 0 to 255 levels for Threshold. Enter 0 to filter all pixels. Enter a larger value to filter only high-contrast edges. Tip Although the Sharpen and Blur filters have opposite effects, they do not negate each other. To reverse the effects of a Sharpen filter, choose Undo in the Edit menu. Original Sharpen More applied 5 times Sharpen Edges applied 8 times Unsharp Mask Amount = 113 Radius = 4.5 Threshold = 0
Canvas 8 Help: Image adjustment and correction (20 of 24)                                           Page #702