图片折叠技巧
先 crop,
再 append 竖直方向
imgcut_fire_ggg(){
read w h < <(identify -format "%w %h" "$1")
convert "$1" -crop $((w*100/100))x$((h*12/100))+0+0 one.png
YYY=58
((HHH= 100 - $YYY))
convert "$1" -crop $((w*100/100))x$((h*HHH/100))+0+$((h*YYY/100)) two.png
convert -append one.png two.png three.png
}
alias gcut="imgcut_fire_ggg"