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Pamdice User Manual(0)							   Pamdice 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 PAM, PBM, PGM, or PPM 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 reassemble 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 processes 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 Standard 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_filename_pattern.  This tells
       pamundice what files contain the input tiles.

       pamundice  reads the input images from files which are named with a pattern that indicates
       their positions in the combined image.  For example, 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 sub-
       routine).  For the example above, it would be tile_%2d_%2a.ppm.	The only possible conver-
       sion 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  preci-
       sion  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 substi-
       tute.

SEE ALSO
       pamundice(1) , pnmcat(1) , pnmindex(1) , pnmtile(1) , pnm(5)

       pnm(5)

netpbm documentation			   1 April 2007 		   Pamdice User Manual(0)
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