png2jpg

if ls *.PNG > /dev/null 2>&1; then
	printf "rename PNG to png\n"
	rename 's/.PNG/.png/' *.png
fi
if ls *.png > /dev/null 2>&1; then
	printf "convert png to jpg\n"
	mogrify -format jpg -quality 95 *.png
	archivename=`date "+%Y%m%d-%H%M-%S%N"`
	printf "add original files to an archive $archivename.tar\n"
	mkdir $archivename
	mv *.png $archivename/
	tar uvf $archivename.tar $archivename
	printf "remove original files\n"
	rm -r $archivename
	printf "done\n"
else
	printf "nothing to do\n"
fi