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Portable Graymap Images

Usage

read.pgm(file)
write.pgm(pgmobj, file="Rimage.pgm", forceplain=FALSE)
plot(pgmobj, xlab=NULL, ylab=NULL, axes=FALSE, ...)

Arguments

pgmobj an object of class pgm
file name of the pgm file
forceplain If TRUE, an ASCII pgm file is written. Default is to write a binary (raw) pgm file.

Description

read.pgm reads a pgm file and loads the image into an object of class pgm, which is basically a matrix. write.pgm writes an object of class pgm to a file.

plot.pgm plots a pgm object using the command image. The only difference is that the element [1,1] of pgmobj is plotted as the upper left corner (plain image would plot [1,1] as the lower left corner.

Value

read.pgm returns an object of class pgm. The maximum gray value (corresponding to the color black) is stored as attribute "maxval").

Author(s)

Friedrich Leisch

See Also

image