Read/Write Portable Anymap Images
Reading and writing of bitmap images in PBM (black/white), PGM (grey) and PPM (color) format.
name of the pnm file (general
further arguments passed to
an object of class
logical; if true, an ASCII pnm file is written. Default is to write a binary (raw) file.
the maximum color-component value; the default is a colour depth of 8 bits, i.e., the integer 255.
read.pnm reads a pnm file and loads the image into an
object of class
write.pnm writes an object of class
pixmap to a
pnm file, the
type argument controls wheter the written image
file is a black-and-white bitmap (pbm), grey (pgm) or color (ppm).
plot.pnm plots a pnm object using the command
image. The only difference is that the element
pnmobj is plotted as the upper left corner (plain
image would plot
[1,1] as the lower left corner.
read.pnm returns an object of class
pixmapRGB for color
pixmaps (ppm), and an object of class
pixmapGrey for pbm
and pgm. Note that the type of file as determined by the first
two bytes according to pnm standards is important, not the
extension of the file. In fact, the file name extension is
Roger Bivand and Friedrich Leisch
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