批量jpg转png 批量png转jpg 批量jpg2png 批量png2jpg

搞个小脚本，简单实现

 jpg2png

#!/bin/bash
# convert jpeg files to png files
# usage: jpg2png <file>...

for f in "$@"
do
    sips -s format png --out "${f%.*}.png" "$f"
done

png2jpg

#!/bin/bash
# convert png files to jpeg files
# usage: png2jpg <file>...

for f in "$@"
do
    sips -s format jpeg --out "${f%.*}.jpg" "$f"
done