The script I use to collect scanned book pages into a pdf

mkpdf.sh

#!/bin/bash

echo "Warning, this script is currently very memory heavy. Use with caution."

shopt -s nullglob nocaseglob

parent_dir="$(pwd)"

for dir in */; do
    [ -d "$dir" ] || continue

    # Collect and sort image files numerically
    mapfile -t images < <(find "$dir" -maxdepth 1 -type f \( -iname "*.jpg" -o -iname "*.jpeg" -o -iname "*.png" -o -iname "*.bmp" -o -iname "*.gif" -o -iname "*.webp" \) | sort -V)

    # Skip if no images found
    if [ ${#images[@]} -eq 0 ]; then
        echo "No images in $dir"
        continue
    fi

    # Output file path
    output_pdf="${parent_dir}/${dir%/}.pdf"

    # Convert to PDF
    magick "${images[@]}" "$output_pdf"
    echo "Created PDF: $output_pdf"
done

shopt -u nullglob nocaseglob

echo "Convertion Complete."