#!/bin/bash

#------------------------------------------------------------------------------#
#
# Größe von Bildern ändern
#
#------------------------------------------------------------------------------#

VERSION="v2020012701"

if [ ! -r "${2}" ] ; then
        echo "${0} 720x540 [Bild.jpg]"
        echo "${0} 720x540 [Bild.jpg] [Bild.jpg]"
        echo "${0} 720x540 [Bild [Bild[...]]]"
        exit 0
fi

NFORMAT="${1}"
shift   

for DATEI in ${@}
do
        BILD="$(basename ${DATEI} | rev | awk '{sub("[.]"," ");print $2}' | rev)"
        OFORMAT="$(identify ${DATEI} | awk '{print $3}' || exit 1)"
        if [ -n "${OFORMAT}" ] ; then

                echo "convert -size ${OFORMAT} ${DATEI} -resize ${NFORMAT} -background black -compose Copy -gravity center -extent ${NFORMAT} -quality 95 ${BILD}_${NFORMAT}.png"

                convert -size ${OFORMAT} ${DATEI} -resize ${NFORMAT} -background black -compose Copy -gravity center -extent ${NFORMAT} -quality 95 ${BILD}_${NFORMAT}.png
                identify ${BILD}_${NFORMAT}.png
        fi
done