The Underpainting effect paints an image onto a textured surface. The underlying texture is visible where the paint is thin,
but it is obscured where the paint has been applied thickly.
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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 higher values to increase the size of the brush, or to the left to decrease the size.
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Set higher values to increase the area in which the underlying texture appears, or set lower values to decrease the area.
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