Get the dimensions of an image

Get the width and height in pixels of an image file or of a raster object.

The dimensions of 'png', 'jpeg' and 'gif' files are read from their header, without decoding the image, which is much faster. Other formats are read with package 'magick', which must then be installed.

Usage

image_dims(x)

Arguments

x

path to an image file, or a raster object (see grDevices::as.raster()).

Value

A named numeric vector: width and height, in pixels.

Examples

img <- file.path(R.home("doc"), "html", "logo.jpg")
image_dims(img)
#>  width height 
#>    100     76 

image_dims(as.raster(matrix(0:1, nrow = 2, ncol = 3)))
#>  width height 
#>      3      2