rawtopgm(1)rawtopgm(1)NAMErawtopgm - convert raw grayscale bytes into a portable graymap
SYNOPSISrawtopgm [-headerskip N] [-rowskip N] [-tb|-topbottom] [width height]
Reads raw grayscale bytes as input. Produces a portable graymap as
output. The input file is just grayscale bytes. If you don't specify
the width and height on the command line, the program will check the
size of the image and try to make a quadratic image of it. It is an
error to supply a non quadratic image without specifying width and
height. The maxval is assumed to be 255.
If the file has a header, you can use this flag to skip over it.
If there is padding at the ends of the rows, you can skip it
with this flag. Note that rowskip can be a real number. Amaz‐
ingly, I once had an image with 0.376 bytes of padding per row.
This turned out to be due to a file-transfer problem, but I was
still able to read the image.
Flips the image upside down. The first pixel in a pgm file is
in the lower left corner of the image. For conversion from
images with the first pixel in the upper left corner (e.g. the
Molecular Dynamics and Leica confocal formats) this flips the
image right. This is equivalent to rawtopgm [file] | pnmflip
If you don't specify the image width and height, the program will try
to read the entire image to a memory buffer. If you get a message that
states that you are out of memory, try to specify the width and height
on the command line. Also, the -tb option consumes much memory.
SEE ALSOpgm(5), rawtoppm(1), pnmflip(1)AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified June 1993 by Oliver Trepte, email@example.com
15 June 1993 rawtopgm(1)