Load PNG, JPG, BMP or GIF from disk or URL.
image_load(file)character, file name. A local file or URL. Extension must be one of png, jpg, jpeg, bmp or gif.
an RBG array
The function will prompt you of the need to install a format-specific package if not installed and needed for
the given file extension; png, bmp, magick (for GIF). jpeg is already imported for purpose of running examples.
x <- paste0(system.file(package = "imgpalr"), "/blue-yellow.",
c("jpg", "png", "bmp", "gif"))
str(image_load(x[1]))
#> num [1:317, 1:400, 1:3] 0.216 0.149 0.125 0.161 0.157 ...
if(require(png)) str(image_load(x[2]))
#> Loading required package: png
#> num [1:158, 1:200, 1:3] 0.153 0.122 0.137 0.133 0.208 ...
if(require(bmp)) str(image_load(x[3]))
#> Loading required package: bmp
#> num [1:158, 1:200, 1:3] 0.153 0.122 0.137 0.133 0.208 ...
#> - attr(*, "header")=List of 13
#> ..$ filesize : num 94854
#> ..$ offset : num 54
#> ..$ header_sz : num 40
#> ..$ width : num 200
#> ..$ height : num 158
#> ..$ nplanes : int 1
#> ..$ depth : int 24
#> ..$ compress_type: num 0
#> ..$ bmp_bytesz : num 94800
#> ..$ hres : num 2835
#> ..$ vres : num 2835
#> ..$ ncolors : num 0
#> ..$ nimpcolors : num 0
if(require(magick)) str(image_load(x[4]))
#> Loading required package: magick
#> Linking to ImageMagick 6.9.12.93
#> Enabled features: cairo, freetype, fftw, ghostscript, heic, lcms, pango, raw, rsvg, webp
#> Disabled features: fontconfig, x11
#> num [1:158, 1:200, 1:3] 0.129 0.102 0.114 0.129 0.196 ...