Compress PNG Finder Automation

gistfile1.txt

for f in "$@"
do
  # Get the base name of the file without the extension
  base_name=$(basename "$f" .png)
  
  # Get the directory where the file is located
  dir_name=$(dirname "$f")
  
  # Create a backup with the ".org.png" extension
  cp "$f" "$dir_name/$base_name.org.png"
  
  # Compress the original image
  /opt/homebrew/bin/pngquant --force --ext .png "$f"
done

Step 1: Install pngquant

1. Open Terminal on your Mac.
2. Install pngquant via Homebrew

brew install pngquant

Step 2: Create an Automator Quick Action

1. Open Automator on your Mac (you can find it using Spotlight or in the Applications folder)
2. Choose New Document
3. In the dialog that appears, select Quick Action
4. At the top of the new workflow, set the following options:
    Workflow receives current: Change this to “image files”
    In: Leave this as “Finder”

Step 3: Add the Shell Script Action

1. In the Library on the left-hand side, search for Run Shell Script.
2. Drag the Run Shell Script action into the workflow pane on the right.
3. In the Run Shell Script action, set the following:
    Pass input: Select “as arguments”
4. Replace the default script with the following pngquant compression script (or the above code to create a backup of the image first)

for f in "$@"
do
  /opt/homebrew/bin/pngquant --force --ext .png "$f"
done

Step 4: Save the Quick Action

1. Go to File → Save
2. Name your Quick Action something like “Compress PNG” (this will be the name that appears when you right-click on files)
3. Click Save

Step 5: Test the Quick Action

1. In Finder, right-click on any PNG image
2. Go to Quick Actions → Compress Image
3. The file will be compressed and the original image will be overwritten with the compressed version