magick (version 2.3)

fx: Image FX

Description

Apply a custom an fx expression to the image.

Usage

image_fx(image, expression = "p", channel = NULL)

Arguments

image

magick image object returned by image_read() or image_graph()

expression

string with an fx expression

channel

a value of channel_types() specifying which channel(s) to set

See Also

Other image: _index_, analysis, animation, attributes(), color, composite, device, edges, editing, effects(), geometry, morphology, ocr, options(), painting, segmentation, transform(), video

Examples

# NOT RUN {
# Show image_fx() expression
if(magick_config()$version > "6.8.8"){
img <- image_convert(logo, colorspace = "Gray")
image_fx(img, expression = "pow(p, 0.5)")
image_fx(img, expression = "rand()")

gradient_x <- image_convolve(img, kernel = "Prewitt")
gradient_y <- image_convolve(img, kernel = "Prewitt:90")
gradient <- c(image_fx(gradient_x, expression = "p^2"),
                image_fx(gradient_y, expression = "p^2"))
gradient <- image_flatten(gradient, operator = "Plus")
#gradient <- image_fx(gradient, expression = "sqrt(p)")
gradient
}
# }

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