png (version 0.1-0)

readPNG: Read a bitmap image stored in the PNG format

Description

Reads an image from a PNG file/content into a raster array.

Usage

readPNG(source)

Arguments

source

Either name of the file to read from or a raw vector representing the PNG file content.

Value

• Array of the dimensions height x width x channels. If there is only one channel the result is a matrix. The values are reals between 0 and 1.

  Most common files decompress into RGB (3 channels) or RGBA (4 channels).

See Also

link{raster}

Examples

# read a sample file (R logo)
img <- readPNG(system.file("img","Rlogo.png",package="png"))
# if your R supports it, we'll plot it
if (exists("raster")) { # can plot only in R 2.11.0 and higher
  plot(1:2,type='n',)
  raster(img,1.2,1.27,1.8,1.73)
}