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Pamundice User Manual(0) Pamundice User Manual(0)
NAME
pamundice - combine grid of images (tiles) into one
EXAMPLE
$ pamdice myimage.ppm -outstem=myimage_part -width=10 -height=8
$ pamundice myimage_part_%1d_%1a.ppm -across=10 -down=8 >myimage.ppm
$ pamundice myimage.ppm myimage_part_%2a -across=13 -hoverlap=9
SYNOPSIS
pamundice
[-across=n]
[-down=n]
[-hoverlap=pixels]
[-voverlap=pixels]
[-verbose]
input_filename_pattern
You can use the minimum unique abbreviation of the options. You can
use two hyphens instead of one. You can separate an option name from
its value with white space instead of an equals sign.
DESCRIPTION
This program is part of Netpbm(1)
pamundice reads a bunch of Netpbm images as input and combines them as
a grid of tiles into a single output image of the same kind on Standard
Output.
You can optionally make the pieces overlap.
See the input_filename_pattern argument for information on naming of
the input files.
The input images must all have the same format (PAM, PPM, etc.) and
maxval and for PAM must have the same depth and tuple type. All the
images in a rank (horizontal row of tiles) must have the same height.
All the images in a file (vertical column of tiles) must have the same
width. But it is not required that every rank have the same height or
every file have the same width.
pamdice is the inverse of pamundice. You can use pamundice to reassem-
ble an image sliced up by pamdice. You can use pamdice to recreate the
tiles of an image created by pamundice, but to do this the original
ranks must all have been the same height except for the bottom one and
the original files must all have been the same width except the right
one.
One use for this is to make pieces that take less computer resources
than the whole image to process. For example, you might have an image
so large that an image editor can't read it all into memory or pro-
cesses it very slowly. You can split it into smaller pieces with
pamdice, edit one at a time, and then reassemble them with pamundice.
An alternative to join images in a single direction (i.e. a single rank
or a single file) is pnmcat. pnmcat gives you more flexibility than
pamundice in identifying the input images: you can supply them on Stan-
dard Input or as a list of arbitrarily named files.
To join piecewise photographs, use pnmstitch instead of pamundice,
because it figures out where the pieces overlap, even if they don't
overlap exactly vertically or horizontally.
To create an image of the same tile repeated in a grid, that's pnmtile.
pnmindex does a similar thing to pamundice: it combines a bunch of
small images in a grid into a big one. But its purpose is to produce a
an index image of the input images. So it leaves space between them
and has labels for them, for example.
ARGUMENTS
There is one non-option argument, and it is mandatory: input_file-
name_pattern. This tells pamundice what files contain the input tiles.
pamundice reads the input images from files which are named with a pat-
tern that indicates their positions in the combined image. For exam-
ple, tile_00_05.ppm could be the 6th tile over in the 1st rank, while
tile_04_01 is the 2nd tile over in the 5th rank.
You cannot supply any of the data on Standard Input, and the files must
be the kind that pamundice can close and reopen and read the same image
a second time (e.g. a regular file is fine; a named pipe is probably
not).
input_filename_pattern is a printf-style pattern. (See the standard C
library printf subroutine). For the example above, it would be
tile_%2d_%2a.ppm. The only possible conversion specifiers are:
d 'down': The rank (row) number, starting with 0.
a 'across': The file (column) number, starting with 0.
% The per cent character (%).
The number between the % and the conversion specifier is the precision
and is required. It says how many characters of the file name are
described by that conversion. The rank or file number is filled with
leading zeroes as necessary.
So the example tile_%2d_%2a.ppm means to get the name of the file that
contains the tile at Rank 0, File 5, you:
o replace the '%2d' with the rank number, as a 2 digit decimal
number: '00'
o Replace the '%2a' with the file number, as a 2 digit decimal
number: '05'
Note that this pattern describes file names that pamdice produces,
except that the precision may be more or less. (pamdice uses however
many digits are required for the highest numbered image).
OPTIONS
-across=N
This is the number of tiles across in the grid, i.e. the number
of tiles in each rank, or the number of files.
Default is 1.
-down=N
This is the number of tiles up and down in the grid, i.e. the
number of tiles in each file, or the number of ranks.
Default is 1.
-hoverlap=pixels
This is the amount in pixels to overlap the tiles horizontally.
pamundice clips this much off the right edge of every tile
before joining it to the adjacent image to the right. The tiles
along the right edge remain whole.
There must not be any input image narrower than this.
Note that this undoes the effect of the same -hoverlap option of
pamdice.
Default is zero -- no overlap.
-voverlap=pixels
This is analogous to -hoverlap, but pamundice clips the bottom
edge of each image before joining it to the one below.
-verbose
Print information about the processing to Standard Error.
HISTORY
pamundice was new in Netpbm 10.39 (June 2007). Before that, pnmcat is
the best substitute.
SEE ALSO
pamundice(1) , pnmcat(1) , pnmindex(1) , pnmtile(1) , pnm(5)
pam(5)
netpbm documentation 1 April 2007 Pamundice User Manual(0)
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