02 Feb 2008 Extracting images from Adobe Acrobat PDF file
This is a short example of how to extract images from a PDF file using ImageMagick
# convert thePDFfile.pdf page-%03d.png # ls page* page-000.png page-001.png page-002.png
Imagemagick can also be used to create Adobe Acrobat PDF documents
convert DSC* resultFile.pdf
The resultfile contains one image per page.
Tags: convert, imagemagick, pdf
Posted by Hans-Henry Jakobsen
30 Dec 2007 Resize and watermark images using Imagemagick
This is a modified version of my Resize of images in a folder with imagemagick post back in February. Only difference this time is that i strips out EXIF tags and the script has been cleaned up a bit. Click on the image to see the result in full size.
#!/bin/bash
# Description:
# Script to resize JPG images to desired width defined in IMAGESIZE variable.
# EXIF tags is also removed from the result images.
# Software needed:
# jhead - http://www.sentex.net/~mwandel/jhead/
# imagemagick - http://www.imagemagick.org
IMAGESIZE="320 480"
for IMAGEFILE in $(ls|grep JPG)
do
for I in $IMAGESIZE
do
# create directories if needed
if [ ! -d $I ]
then
mkdir $I
fi
# Strip EXIF tag information from source file
jhead -purejpg $IMAGEFILE
# Resize file
base=`basename $IMAGEFILE .JPG`_Resized_$I.JPG
convert $IMAGEFILE -resize $I $base
# Watermark the file
width=`identify -format %w $base`
convert -background '#0008' -fill white -gravity center -size ${width}x15 \
-font Verdana -pointsize 10 \
caption:"Copyright © 2007 Pario.no" \
+size $base +swap -gravity south -composite $I/$base;
# delete resized file
rm $base
done
# Delete source file (DO NOT USE YOUR ORIGINAL FILE!)
rm $IMAGEFILE
done
You can download my resize, watermark bash script here.
Tags: bash, convert, imagemagick, jhead
Posted by Hans-Henry Jakobsen
25 Nov 2007 Adjust images to a digital frame (480×234 pixels)
This bash script adjusts images to fit in a digital frame with a resolution of 480×234 pixels however by using the size 832×468 pictures are displayed sharper on some frames. Normally, narrower pictures will have black borders at both sides when displayed. but this script makes the border color the average of the picture.
The following linux tools are used in the script: convert and montage, bash, od and awk. od is part of the textutils package in Debian.
#!/bin/bash
# current directory contains source JPG files
# $DESTINATION is where the prepared JPG files are stored
# $TEMP is a temporary directory
TEMP=TEMP
DESTINATION=DESTINATION
GEO=832x468 # geometry of target JPG files and resize value
for FILE in *.JPG
do
convert -resize 1x1 "$FILE" "$TEMP/1x1.bmp"
od -A n -j 54 -t u1 "$TEMP/1x1.bmp" | awk -v f="$FILE" -v des="$DESTINATION/" -v geo="$GEO" '
{
print "montage -geometry", geo, "-resize", geo, "-background rgb\\(" $3 \
"," $2 "," $1 "\\) \"" f "\" \"" des f "\"";
exit;
}'
done | sh -x
Source: comp.graphics.misc
Tags: awk, bash, convert, Debian, montage, od
Posted by Hans-Henry Jakobsen
25 Nov 2007 Great collection of advanced Imagemagick scripts
Today I stumbled upon Fred’s Imagemagick Scripts, a nice collection of bash scripts to do image manipulations like
- 3D rotate
- change/enhance brightness
- Superimposes a set of horizontal and/or vertical grid lines on an image
- etc…
Tags: convert, imagemagick
Posted by Hans-Henry Jakobsen
25 Nov 2007 Create a photo montage using imagemagick
This is a little bash script I put together to create a photo montage with 5 resized pitures in max 3 rows using imagemagick. The script is run from within the folder I have filled with the JPG images I want to create a montage from.
#!/bin/bash
for image in `ls *.JPG`
do
convert -resize 50x50! $image small-$image
done
montage small-*.JPG -mode Concatenate -tile 5x3 montage_final.jpg
The result file like the one below is saved with the filename montage_final.jpg.
One disadvantage using this technique is that it doesn’t keep the aspect ratio of the pictures.
You find more examples of montage usage by visiting the ImageMagick v6 Examples — Montage, Arrays of Images page.
Tags: bash, convert, imagemagick, JPG, montage
Posted by Hans-Henry Jakobsen
