read.pnm(file) plot(pnmobj, xlab="", ylab="", axes=FALSE, ...) write.pgm(pnmobj, file="Rimage.pgm", forceplain=FALSE)
pnmobj
|
an object of class pnm
|
file
| name of the pnm file |
forceplain
|
If TRUE, an ASCII pgm file is written. Default
is to write a binary (raw) pgm file.
|
read.pnm reads a pnm file and loads the image into an
object of class pnm, which is basically a
matrix (pbm, pgm) or a 3-dimensional arry with 3 matrices for red,
green and blue.
write.pgm writes an object of class pnm to a
pgm file. Generalizations for writing pbm and ppm files are yet to be
written.
plot.pnm plots a pnm object using the command
image. The only difference is that the element [1,1] of
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 pnm. The maximum
value (of either grey or the red/green/blue channels) is stored as
attribute "maxval"). The type (pbm, pgm or pnm) is stred as
attribute "type").image