SYNOPSIS
pnmpaste

[-replace|-or|-and|-xor]

frompnmfile x y [intopnmfile]

You can abbreviate all options to their shortest unique prefix.


DESCRIPTION
This program is part of Netpbm.

pnmpaste reads two PNM images as input and inserts the first image
(the "pasted image") into the second (the "base image") at the speci-
fied location, and produces a PNM image the same size and type as the
base image as output. If you don't specify the second file, pnmpaste
reads the base image from Standard Input.

x and y specify the location in the base image at which to put the top
left corner of the pasted image, x giving the horizontal position and
x giving the vertical position. A nonnegative value indicates the
number of pixels right of the right edge or below the top edge of the
base image, while a negative value indicates the number of pixels
right of the right edge or below the bottom edge (so x = -5 means 5
pixels left of the right edge).

If any part of the pasted image does not fit within the base image,
pnmpaste fails.

This tool is most useful in combination with pamcut. For instance, if
you want to edit a small segment of a large image, and your image edi-
tor cannot edit the large image, you can cut out the segment you are
interested in, edit it, and then paste it back in.

Another useful companion tool is pbmmask.

pamcomp is a more general tool, except that it lacks the 'or,' 'and,'
and 'xor' functions. pamcomp allows you to specify an alpha mask in
order to have only part of the inserted image get inserted. So the
inserted pixels need not be a rectangle. You can also have the
inserted image be translucent, so the resulting image is a mixture of
the inserted image and the base image.


OPTIONS
The option specifies the operation to use when doing the paste. The
default is -replace, which means to do the obvious paste: replace pix-
els of the 'into' image with those of the 'from' image.

-and, -or, and -xor are allowed only if both input images are PBM
images. They say to combine the 'from' and 'into' images by perform-
ing boolean operations: Each pixel of the output image is the result
of the boolean operation on the corresponding pixels of the two input
image, where white is TRUE and black is FALSE.

Note that this is different from what you would get by doing a bit
arithmetic on the bits in the PBM images, because in PBM, white is
represented by a 0 bit, and 0 in bit arithmetic corresponds to FALSE
in boolean arithmetic.


SEE ALSO
pamcomp, pamcut, pnminvert, pnmarith, pbmmask, pnm


AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer.



netpbm documentation 21 February 1991 Pnmpaste User Manual(0)