Adobe Photoshop CC 2014 v.14.xx - Manual (Page 396)

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Choose a brush tip and set options for the blending mode and strength in the options bar.
Select Sample All Layers in the options bar to blur using data from all visible layers. Deselect this option and the tool uses data from
only the active layer.
3. Drag over the part of the image you want to blur.
Sharpen image areas
The Sharpen tool increases contrast along edges to increase apparent sharpness. The more you paint over an area with the tool, the more
sharpening increases.
1. Select the Sharpen tool . (If the tool isn’t visible, hold down the Blur tool.)
2. Do the following in the options bar:
Choose a brush tip and set options for the blending mode and strength.
Select Sample All Layers to sharpen using data from all visible layers. If this is deselected, the tool uses data from only the active
layer.
Select Protect Detail to enhance details and minimize pixelated artifacts. Deselect this option if you want to produce more exaggerated
sharpening effects.
3. Drag over the part of the image you want to sharpen.
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