target_size=$1
infile=$2
q=99
insize=$(identify -format '%b' "$2")

spin()
{
    # Print spaces to overwrite previous line
    echo -ne "\r                                                            "
    echo -ne "\r$@ "
}
echo $2 is $insize and target_size is $target_size
while ((insize > target_size)); do
    spin "Trying -quality $q"
    outname=/tmp/$(basename ${infile%.*}).jpg
    convert "$infile" -quality $q "$outname"
    if (( $(identify -format '%b' "$outname") <= target_size )); then
        echo
        echo Success using -quality $q !
        echo
        echo Output file is "${infile%.*}-${q}.jpg"
        mv  "$outname" "${infile%.*}-${q}-.jpg"
        insize=$target_size
    fi
    ((q--))
done