Annotate photos with the date. in white. corner bottom right. size of the font relative to the photo resolution.

annotate_photos.sh

out=`pwd`/OUT
rm -rf $out
mkdir $out || exit;
for d in raw/*; do
  if [ -d $d ]; then
    cd $d || exit;
    mkdir $out/$d || exit;
    for f in *; do
      echo "$f => $out/$d/$f";
      text=`exiftool -d '%d %b %Y' $f | grep 'Time Original' | head -n 1 | cut -f2 -d':'`;
      size=`exiftool $f | egrep "Width|Height" | cut -f2 -d':' | sort -nr | head -1`
      size=$((size / 64))
      convert $f -font Helvetica -pointsize $size -gravity SouthEast \
        -stroke none -fill white -annotate +$size+$((size/2)) "$text" \
        $out/$d/$f;
    done;
    cd ..;
  fi;
done;