R: Combine images using Porter-Duff operations.

feComposite {gridSVG}

R Documentation

Combine images using Porter-Duff operations.

Description

This filter performs the combination of the two input images pixel-wise in image space using one of the Porter-Duff compositing operations.

The arithmetic operation is useful for combining the output from the feDiffuseLighting and feSpecularLighting filter effects with texture data. It is also useful for implementing dissolve.

Usage

feComposite(input1 = NA, input2 = NA,
            operator = c("over", "in", "out", "atop",
                         "xor", "arithmetic"),
            k1 = 0, k2 = 0, k3 = 0, k4 = 0, ...)

Arguments

`input1`	Identifies an input for this filter primtive. See `filterInputs`.
`input2`	Identfies a second input for this filter primitive. See `filterInputs`.
`operator`	The compositing operation that is to be performed. All of the `operator` types except `"arithmetic"` match the corresponding operation as described in the referenced Porter-Duff text. The arithmetic operator is described in the referenced SVG specification.
`k1`	A numeric value. Only applicable if `operator` is `"arithmetic"`.
`k2`	A numeric value. Only applicable if `operator` is `"arithmetic"`.
`k3`	A numeric value. Only applicable if `operator` is `"arithmetic"`.
`k4`	A numeric value. Only applicable if `operator` is `"arithmetic"`.
`...`	Further arguments to be passed onto `fe`.

Details

For more information about this primitive, consult the reference to the SVG specification.

Value

An fe.composite object.

Author(s)

Simon Potter

References

https://www.w3.org/TR/SVG/filters.html#feCompositeElement

Compositing Digital Images, T. Porter and T. Duff. SIGGRAPH '84 Conference Proceedings, Association for Computing Machinery, Volume 18, Number 3, July 1984.