Web editors often have the need to edit a large number of images. For example, the large image size of professional cameras tends to be overkill for most sites. I wanted a quick and easy way to resize large images and that was how I found ImageMagick.
ImageMagick is a suite of tools and according to the man page, we can “use it to convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more”. First, let’s install imagemagick:
sudo apt-get install imagemagick
Then, we can use the convert command to do the actual edition. Check the man page to see the astounding number of options this command has. For example, if I want to resize all the JPG images in the current directory to a width of 1280 pixels and save the resulting images as the same name but with “min-” before the name I would execute the following command:
for file in *.JPG; do convert $file -resize 1280 min-$file; done
And here lies the advantage of ImageMagick: it can be used in a script to edit images extremely quickly. ImageMagick can also be used on Mac OS X and Windows. For more information about the convert command, refer to http://www.imagemagick.org/script/convert.php