convert -append *.png out.png
* 직접지정
convert img1.png img2.png .... -append out.png
===== 참고 =====
* [[http://www.linuxjournal.com/content/easy-watermarking-imagemagick|Imagemagick Watermarking]]
* [[https://imagetragick.com/|ImageTragick]] 이미지매직 보안 문제. 필히 확인