用ImageMagick给图片添加水印

体验 了一下ImageMagick的强大，用ImageMagick给图片添加水印，为了批量操作，写成了一个shell.

输入参数为：水印图片，图片所在文件夹

#!/bin/bash

echo "Image watermarking Script"

echo ""

if [ $# -ne 2 ]
then
    echo "usage: ./watermark watermark.jpg picture_directory"
    echo ""
        exit
fi

WATERMARK=$1
PICDIR=$2
for each in $PICDIR/*{.jpg,.jpeg,.png,.JPG,.JPEG,PNG}
do
    #mv "$each" `echo $each | tr ' ' '_'`;
    composite -gravity center  -dissolve 15.3 $WATERMARK$each $each 2> /dev/null
    echo "$each: done!"
done
exit 0