Image Converting Shell Script

[dl14]

Hello,

I have made an image converting shell script that takes screenshots from a mac and converts the .png to a .jpg that's compatible with the Gameduino2.. let me know what you guys think and if there's any way to make it more convenient! 

Note: the naming convention I use is for a specific project of mine 

read -p "Chapter number? " CH
read -p "Verse number? " NUM
newNum=$NUM
# add a leading 0 if it's a 1 digit #
if [ $CH -lt 10 ] ; then
   newCH="0$CH"
else
   newCH="$CH"
fi

for FILES in *.png
do
   # name format is: "Ch##_##.jpg" for my project
   # change here for different name
   if [ $NUM -lt 10 ] ; then
       FILENAME="Ch${newCH}_0${NUM}.jpg"
   else
       FILENAME="Ch${newCH}_${NUM}.jpg"
   fi
   echo "$FILES"
   sips -s format jpeg "$FILES" --out "$FILENAME"
   sips -z 210 479 $FILENAME
   convert -sampling-factor 4:2:0 $FILENAME
   let NUM=($NUM+1)
done

rm *.png