A fast command line interface solution for batch image processing.
Part of my Hugo site continuous deployment workflow is the processing of 210 images, at time of writing.
Here’s my one-liner:
find public/ -not -path "*/static/*" ( -name '*.png' -o -name '*.jpg' -o -name '*.jpeg' ) -print0 | xargs -0 -P8 -n2 mogrify -strip -thumbnail '1000>' -format jpg
I use find to target only certain image file formats in certain directories. With mogrify, part of ImageMagick, I resize only the images that are larger than a certain dimension, compress them, and strip the metadata. I tack on the format flag to create jpg copies of the images.
Here’s the one-liner again (broken up for better reading):
# Look in the public/ directory
find public/
# Ignore directories called "static" regardless of location
-not -path "*/static/*"
# Print the file paths of all files ending with any of these extensions
( -name '*.png' -o -name '*.jpg' -o -name '*.jpeg' ) -print0
# Pipe the file paths to xargs and use 8 parallel workers to process 2 arguments
| xargs -0 -P8 -n2
# Tell mogrify to strip metadata, and...
mogrify -strip
# ...compress and resize any images larger than the target size (1000px in either dimension)
-thumbnail '1000>'
# Convert the files to jpg format
-format jpg
That’s it. That’s the post.