make a photosheet for photos in folder

make_contact_sheets.sh

#!/bin/bash
# Usage: make_contact_sheets.sh <source_dir> <dest_dir>
# Builds numbered contact-sheet grids (chronological, labeled by filename) for one event.
set -e

SRC="$1"
DEST="$2"
CHUNK=24         # photos per sheet
TILE="6x4"
THUMB="240x240"

mkdir -p "$DEST"

# Gather image files (jpg/jpeg/png/heic), skip videos, skip meta "-=...=-" overview files, sort chronologically (filenames are timestamps)
FILES=()
while IFS= read -r line; do
  FILES+=("$line")
done < <(find "$SRC" -maxdepth 3 -type f \( -iname "*.jpg" -o -iname "*.jpeg" -o -iname "*.png" -o -iname "*.heic" \) ! -iname "-=*" | sort)

TOTAL=${#FILES[@]}
echo "Found $TOTAL photos in: $SRC"

i=0
sheet=1
while [ $i -lt $TOTAL ]; do
  batch=("${FILES[@]:$i:$CHUNK}")
  outfile=$(printf "%s/contact_sheet_%02d.jpg" "$DEST" "$sheet")
  magick montage \
    -font "/System/Library/Fonts/Supplemental/Andale Mono.ttf" -pointsize 13 -fill white -background '#202020' \
    -auto-orient -label '%f' \
    "${batch[@]}" \
    -geometry "${THUMB}+6+6" -tile "$TILE" \
    "$outfile"
  echo "Wrote $outfile (${#batch[@]} photos)"
  i=$((i + CHUNK))
  sheet=$((sheet + 1))
done