The Graphic Pen effect uses fine linear ink strokes to capture details in the original image. The result appears to have been
drawn on paper laid against a fine-grained wood surface. The pen strokes are denser in darker areas, but are not visible in
lighter areas.
By default, this effect produces a monochrome (gray-scale) image.
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Specifies the operator's name.
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Sets the opacity of the effect over the input image. A value of 0 makes the effect completely transparent, while a value of
100 makes it completely opaque.
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Uses the input image's alpha channel as a mask for applying the effect. The effect is fully applied to areas of the image
where the alpha channel is white, and not at all to areas where it is black.
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Enable the RGB and/or Alpha options to specify whether the effect is applied to the RGB channels, the Alpha channel, or both.
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Set lower values to shorten the ink strokes, or set higher values to lengthen the strokes.
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Select a direction in which to draw ink strokes Right Diagonal, Horizontal, Left Diagonal, or Vertical.
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Set lower values to give the image a higher proportion of white (background color), or set higher values for a higher proportion
of black (foreground color).
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Sets the color for background regions of the effect. Set a color using the sliders.
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Sets the color for foreground regions of the effect. Set a color using the sliders.
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