autocrop: autocrop

In jhollist/autocrop: Automatically Remove Surrounding Whitespace from an Image

Description

Automatically crop away white space form an image. Can read any image supported by raster.

Usage

autocrop(x, border = 2, outfile = NULL, format = NULL,
  width = NULL, units = "in", res = 150, ...)

Arguments

x	a file or a raster object
border	border of whitespace, in pixels, to leave around image.
outfile	output file to save. Defaults to NULL
format	file format type. Guessed by outfile extension.
width	width is specified (defaults to current device width). Height is determined by aspect ratio of cropped image.
units	units defualts to inches, but may be any units supported by the output format.
res	output dpi. Defaults to 150.
...	parameters to pass to specfified output device (e.g. tiff()).

Examples

x<-rep(0,49)
x[18]<-1
x[24:25]<-1
x[31:32]<-1
x<-raster::stack(raster::raster(matrix(x,ncol=7,byrow = TRUE)))
raster::extent(x) <- raster::extent(c(1,7,1,7))
x_ac<-autocrop(x,border=0)
x_ac<-autocrop(system.file("extdata/big_test.tiff",package="autocrop"), outfile = "test_devs.tiff", width = 6.1, res = 450, compression = "lzw")

jhollist/autocrop documentation built on May 19, 2019, 9:27 a.m.