The Palette Knife tool 
interacts with the medium on the canvas. Generally, you use it with strokes placed by the Oil Brush tool as this is the only tool that applies large amounts of its medium. As the mass of the medium reduces in a spot, there is less to smear and using the Palette Knife tool has less effect. This means that the Crayon tool, which applies very little medium, is only slightly affected by the Palette Knife tool.
The method of loading or cleaning the Palette Knife tool is similar to the Oil Brush tool. You can clean it automatically after each stroke, retain the color picked up from the canvas, or allow manual cleaning. You can use the Palette Knife tool to apply pigment or smear it.
Paint strokes applied by the Palette Knife tool are wet in terms of how strokes interact with other strokes by smearing or mixing together. For more information, see To dry or wet an Art Media layer.
Edit workspace
Palette Knife tool options include
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Shape — defines the shape of the knife tip |
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Size — defines the size of the tool head in pixels |
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Thickness — defines the aspect ratio of the tool head |
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Rotation — defines the angle of head rotation |
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Head Tracking — controls whether the tool head bends around the path of the user’s stroke, or remains at a fixed angle |
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Head Loading — defines the percentage of material on the brush at the start of the stroke |
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Auto Clean check box — cleans the tool and dips it into fresh paint at the start of a new stroke |
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Clean button — cleans the head and start the next stroke with fresh paint or pigment. |
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Trace check box — allows the Palette Knife tool to select the pigment or paint color by sampling the data below the center of the tool regardless of the layer type. |
Important! When you hold down the mouse button to begin the stroke, note that a single sample is performed and the resulting color is used for the duration of the stroke.
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