Image FX
Apply a custom an fx expression to the image.
image_fx(image, expression = "p", channel = NULL) image_fx_sequence(image, expression = "p")
image |
magick image object returned by |
expression |
string with an fx expression |
channel |
a value of |
There are two different interfaces. The image_fx function simply applies the same fx to each frame in the input image. The image_fx_sequence function on the other hand treats the entire input vector as a sequence, allowing you to apply an expression with multiple input images. See examples.
# Show image_fx() expression
img <- image_convert(logo, colorspace = "Gray")
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
image_fx(img, expression = "pow(p, 0.5)")
image_fx(img, expression = "rand()")
# Use multiple source images
input <- c(logo, image_flop(logo))
image_fx_sequence(input, "(u+v)/2")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.