Pnmmontage User Manual(1) General Commands Manual Pnmmontage User Manual(1)
NAME
pnmmontage - create a montage of PNM images
SYNOPSIS
pnmmontage
[-header=headerfile]
[-quality=n]
[-prefix=prefix]
[-0|-1|-2|...|-9]
[-data=filename]
pnmfile...
DESCRIPTION
This program is part of Netpbm(1).
pnmmontage packs images of differing sizes into a minimum-area compos-
ite image.
Areas of the output that cannot be occupied by an image are black.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), pnmmontage recognizes the
following command line options:
-data=filename
This option causes pnmmontage to write a file that describes in
machine-readable form the positions of the original images
within the packed image. Here is an example:
:0:0:227:298
../image1.ppm:0:0:227:149
../image2.ppm:0:149:227:149
There is a line for each component image and one for the compos-
ite.
The 5 fields on each line are:
• source image name (or null string indicating the line for the
composite image)
• Column number of upper left corner of the image
• Row number of upper left corner of the image
• width of the image (columns)
• height of the image (rows)
This option was new in Netpbm 10.6 (July 2002).
-header=filename
Tells pnmmontage to write a C header file of the locations of
the original images within the packed image. Each original im-
age generates four #defines within the packed file: xxxX, xxxY,
xxxSZX, and xxxSZY, where xxx is the name of the file, converted
to all uppercase. The output also includes #defines OVERALLX
and OVERALLY, which specifies the total size of the montage im-
age.
Here is an example:
#define OVERALLX 227
#define OVERALLY 298
#define X 0
#define Y 0
#define SZX 227
#define SZY 149
#define X 0
#define Y 149
#define SZX 227
#define SZY 149
-prefix
Tells pnmmontage to use the specified prefix on all of the #de-
fines it generates.
-quality
Before attempting to place the subimages, pnmmontage will calcu-
late a minimum possible area for the montage; this is either the
total of the areas of all the subimages, or the width of the
widest subimage times the height of the tallest subimage, which-
ever is greater. pnmmontage then initiates a problem-space
search to find the best packing; if it finds a solution that is
(at least) as good as the minimum area times the quality as a
percent, it will break out of the search. Thus, -quality=100
will find the best possible solution; however, it may take a
very long time to do so. The default is -quality=200.
-0, -1, ... -9
These options control the quality at a higher level than -qual-
ity; -0 is the worst quality (pick the first solution found),
while -9 is the best quality (perform an exhaustive search of
problem space for the absolute best packing). The higher the
number, the slower the computation. The default is -5.
NOTES
Using -9 is very slow on all but the smallest image sets.
The minimum area arrangement is often not a convenient shape. For ex-
ample, it might be a tall, thin column of images, when you'd rather
have something more square. To force a minimum width or height, you
can include a strut image - a black image that wide and one pixel high.
Similarly, you can use a vertical strut to force a minimum height.
SEE ALSO
pnmcat(1), pnmindex(1), pnm(1), pam(1), pbm(1), pgm(1), ppm(1)
HISTORY
pnmmontage was new in Netpbm 9.10 (January 2001).
AUTHOR
Copyright (C) 2000 by Ben Olmstead.
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/pnmmontage.html
netpbm documentation 22 November 2012 Pnmmontage User Manual(1)
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