This does not change size of the image in pixels, nor does it affect appearance -- it is lossless compression. This requires GraphicsMagick (recommended) or ImageMagick to be installed.
resize(filename, geometry)
Character vector containing the path of images to resize.
Scaling specification. Can be a percent, as in "50%"
,
or pixel dimensions like "120x120"
, "120x"
, or "x120"
.
Any valid ImageMagick geometry specifation can be used. If filename
contains multiple images, this can be a vector to specify distinct sizes
for each image.
if (interactive()) {
# Can be chained with webshot() or appshot()
webshot("https://www.r-project.org/", "r-small-1.png") %>%
resize("75%")
# Generate image that is 400 pixels wide
webshot("https://www.r-project.org/", "r-small-2.png") %>%
resize("400x")
}