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" "$f"donepng2jpg
#!/bin/bash# convert png files to jpeg files# usage: png2jpg <file>...for f in "$@"do sips -s format jpeg --out "${f%.*}.jpg" "$f"done