[magick-users] Composite or montage command to stack images

[Anthony Thyssen]

On Mon, 19 Jan 2009 23:03:03 +0700
magick-users-bounces at imagemagick.org wrote:

| On Mon, Jan 19, 2009 at 10:16 PM, elliott-brennan
| <elliottbrennan at gmail.com> wrote:
| > Hi all,
| >
| > I've trying to pull together a command to create
| > the following image:
| >
| > Three images stacked vertically on the left and
| > one image taking up the right hand side of the
| > frame. The right hand image would take up the
| > whole right hand half of the total image.
| >
| > I can't quite get it with -gravity (e.g.
| > NorthWest, West, SouthWest and East) as I keep
| > getting four images in each corner.
| >
| > Should I be creating images each with transparent
| > borders the size of the areas where the other
| > images are meant to go and then creating a montage
| > somehow?
| >
| > Could someone please point me in the correct
| > direction for this?
| 
| Here is a script I have used to build a montage using convert:
| <script>
| #!/bin/sh
| # comp_l.sh - compose landscape pics
| 
| convert -size 3000x2400 xc:white \
|     dscn0556.png -geometry +10+10 -composite \
|     dscn0560.png -geometry +801+10 -composite \
|     dscn0561.png -geometry +1592+10 -composite \
|     dscn0568.png -geometry +10+607 -composite \
|     dscn0573.png -geometry +801+607 -composite \
|     dscn0577.png -geometry +1592+607 -composite \
|     dscn0581.png -geometry +10+1204 -composite \
|     dscn0582.png -geometry +801+1204 -composite \
|     dscn0583.png -geometry +1592+1204 -composite \
|     dscn0584.png -geometry +10+1801 -composite \
|     dscn0588.png -geometry +801+1801 -composite \
|     dscn0589.png -geometry +1592+1801 -composite \
|     landscapes.png
| 
| exit 0
| </script>
| 
| This makes no use of -gravity at all because I have pre-calculated all
| positions.
| Note than when using -gravity any position data you give it works
| toward the inside of the picture.
| 
As you are only outputing an array in absolute coordinates
you maybe be able to automatically generate positions better
by using a pipeline type script.

See  Layering Examples...
  http://www.imagemagick.org/Usage/layers/#example

Though memory wise the above may be better as only one extra
image is in memory at any one time.

ASIDE: the equivelent 'layer' example is...
(Note layer flattening/merging automatically
generate a canvas of the current background color.

convert -page 3000x2400 \
   -page +10+10     dscn0556.png \
   -page +801+10    dscn0560.png \
   -page +1592+10   dscn0561.png \
   -page +10+607    dscn0568.png \
   -page +801+607   dscn0573.png \
   -page +1592+607  dscn0577.png \
   -page +10+1204   dscn0581.png \
   -page +801+1204  dscn0582.png \
   -page +1592+1204 dscn0583.png \
   -page +10+1801   dscn0584.png \
   -page +801+1801  dscn0588.png \
   -page +1592+1801 dscn0589.png \
   -background white   -flatten   landscapes.png

NOTE: -page only sets a position for any image read/created after that
setting.

OR here is the -repage equivelent...

convert \
   \( dscn0556.png -repage +10+10     \) \
   \( dscn0560.png -repage +801+10    \) \
   \( dscn0561.png -repage +1592+10   \) \
   \( dscn0568.png -repage +10+607    \) \
   \( dscn0573.png -repage +801+607   \) \
   \( dscn0577.png -repage +1592+607  \) \
   \( dscn0581.png -repage +10+1204   \) \
   \( dscn0582.png -repage +801+1204  \) \
   \( dscn0583.png -repage +1592+1204 \) \
   \( dscn0584.png -repage +10+1801   \) \
   \( dscn0588.png -repage +801+1801  \) \
   \( dscn0589.png -repage +1592+1801 \) \
   -repage 3000x2400 -background white -flatten \
   landscapes.png

NOTE: The parenthesis limits the -repage position to just the image read
in while inside parenthesis.

Your choice as to which technique is used.

See the whole section on
   Layers of Multiple Images
     http://www.imagemagick.org/Usage/layers/


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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       Computers are dumb... Unless otherwise stated!
                                               -- Anthony Thyssen
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/