Recursive crop with Imagemagick
Marzo 4th, 2010 — 2:12am
A very simple and tiny shellscript for cropping images recursively with Imagemagick on Linux. In my case I am working on a Ruby on Rails website, managing images and its thumbnails with attachment_fu. After some months I decided to convert all user stored thumbnails to a cropped format. This is what this script was for.
#!/bin/bash
#
# very little and tiny shellscript for cropping images
# massively and recursively with Linux and Imagemagick
# Make sure you have Imagemagick installed (ie: try to
# execute "convert" binary)
#
# USAGE: place this script in your images parent directory,
# edit and change the size names and widths
#
# Ivan Belmonte <ivan@ivanhq.net - http://ivanhq.net>
SIZES="icon:48 thumb:120" # change them for your needs
FORMATS="jpg JPG jpeg JPEG gif GIF png PNG"
# remove previously sized files
for SIZE in ${SIZES}; do
SIZENAME=`echo ${SIZE} | cut -f 1 -d :`
find . | grep -i _${SIZENAME} | xargs rm -f
done
# start resizing and cropping
for FORMAT in ${FORMATS}; do
for FILE in `find . | grep ${FORMAT}`; do
for SIZE in ${SIZES}; do
SIZENAME=`echo ${SIZE} | cut -f 1 -d :`
SIZEWIDTH=`echo ${SIZE} | cut -f 2 -d :`
FILENAME=`echo ${FILE} | sed s/".${FORMAT}"//g`
convert ${FILE} -resize \
"${SIZEWIDTH}^>" ${FILENAME}_${SIZENAME}.${FORMAT}
convert -gravity Center -crop \
${SIZEWIDTH}x${SIZEWIDTH}+0+0 \
${FILENAME}_${SIZENAME}.${FORMAT} \
${FILENAME}_${SIZENAME}.${FORMAT}
done
done
done
echo "OK"
# enjoy :-)
#
# very little and tiny shellscript for cropping images
# massively and recursively with Linux and Imagemagick
# Make sure you have Imagemagick installed (ie: try to
# execute "convert" binary)
#
# USAGE: place this script in your images parent directory,
# edit and change the size names and widths
#
# Ivan Belmonte <ivan@ivanhq.net - http://ivanhq.net>
SIZES="icon:48 thumb:120" # change them for your needs
FORMATS="jpg JPG jpeg JPEG gif GIF png PNG"
# remove previously sized files
for SIZE in ${SIZES}; do
SIZENAME=`echo ${SIZE} | cut -f 1 -d :`
find . | grep -i _${SIZENAME} | xargs rm -f
done
# start resizing and cropping
for FORMAT in ${FORMATS}; do
for FILE in `find . | grep ${FORMAT}`; do
for SIZE in ${SIZES}; do
SIZENAME=`echo ${SIZE} | cut -f 1 -d :`
SIZEWIDTH=`echo ${SIZE} | cut -f 2 -d :`
FILENAME=`echo ${FILE} | sed s/".${FORMAT}"//g`
convert ${FILE} -resize \
"${SIZEWIDTH}^>" ${FILENAME}_${SIZENAME}.${FORMAT}
convert -gravity Center -crop \
${SIZEWIDTH}x${SIZEWIDTH}+0+0 \
${FILENAME}_${SIZENAME}.${FORMAT} \
${FILENAME}_${SIZENAME}.${FORMAT}
done
done
done
echo "OK"
# enjoy :-)
Siempre cuando he impartido cursos de Linux lo he hecho bajo 
Como muchos sabeis, el comienzo de mi andadura como usuario de Linux se centró en la distribución de Slackware, de la que he sido usuario durante 5 o 6 años en todos los entornos, y que implanto ahora en mis servidores personales y una parte de los de