Export slide images from keynote and crop to a specific size.

Export and Crop.workflow.zip

export-and-crop.sh

#!/usr/bin/env bash

set -e

# $1 is the keynote file to process

FILE=$1
OUTPUT_DIR=$(dirname $FILE)/output
FULL_DIR=$OUTPUT_DIR/full
CROP_DIR=$OUTPUT_DIR/crop
CROP_CMD="1920x650+0+215"

mkdir -p "$OUTPUT_DIR" "$FULL_DIR" "$CROP_DIR"

echo "Processing $FILE"
echo "Outputting to $OUTPUT_DIR"

# Export to images
osascript <<EOF
  tell application "Keynote"
    activate
    set keynote_file to open ("$FILE" as POSIX file)
    export keynote_file to ("$FULL_DIR" as POSIX file) as slide images with properties { image format: PNG, skipped slides: false }
    close keynote_file saving no
  end tell
EOF

# Crop images
for file in "$FULL_DIR"/*.png; do
  /usr/local/bin/magick "$file[$CROP_CMD]" -gravity north -background black -extent 1920x1080 "$CROP_DIR/$(basename "$file" | sed 's|full|crop|g')"
done

# We're done!
osascript <<EOF
  tell app "System Events"
    display dialog "Done!" buttons {"Yay!"}
  end tell
EOF

open $OUTPUT_DIR