Batch Resize
Contents
Why
As of 2018, the OSE wiki has a strict upper file size limit of 1M as our OSE Server infrastructure is operating on a very limited budget. For more information on why this is necessary, see Mediawiki#$maxUploadSize
These commands can trivialize the process of doing a bulk resize of images before uploading to the wiki.
Imagemagick
All it takes is one line to resize a directory full of images to your desired size if you have the ImageMagick tools package installed. convert is a tool that comes with that package.
To install ImageMagick, go to Terminal and type: (on Debian/Ubuntu based systems)
sudo apt-get install imagemagick
To resize only, go to the directory of interest and execute a command using find and convert, like so:
Note: This will permanently alter all of your image files! Make sure to copy your image files to a duplicate 'working' directory before running this command. Do not run these commands in the directory where your original files live.
# most robust; handles portrait & landscape images of various dimensions
# 786433 = 1024*768+1
find . -maxdepth 1 -iname '*.jpg' -exec convert {} -resize '786433@>' {} \;
# or use this if all the photos are the same orientation
find . -maxdepth 1 -iname '*.jpg' -exec convert {} -resize 1024x768 {} \;
To resize and convert to another format (example converts JPEG to PNG):
find . -iname '*.jpg' -exec convert {} -resize 640x480 {}.png \;
mogrify
Go into Terminal and change directory to folder with your pictures with whatever percentage reduction yuou need - here it is 25%:
mogrify -resize 25% *
To switch to another format - jpg may be replaced with other formats.
mogrify -resize 50% -format jpg *
