Pass an X.tiff file to this --> X.png

tiff-to-png.sh

#!/bin/bash
 
echoerr() { echo "$@" 1>&2; }
 
if [ "X" == "X$1" ]; then
  echoerr "error: requires argument: path to .tiff file"
  exit 1
fi
 
exe=`which sips`
if [ "X" == "X$exe" ]; then
    echoerr "error: cannot find sips program"
    exit 1
fi
 
outputfile=`echo "$1" | sed 's/\.tiff$/\.png/'`
if [ "$1" == "$outputfile" ]; then
    echoerr "error: file must end in .tiff"
    exit 1
fi
if [ -f $outputfile ]; then
    echoerr "error: already exists: $outputfile"
    exit 1
fi
 
CMD="$exe -s format png $1 --out $outputfile"
echo "Running: $CMD"
exec $CMD