imagick - create an irregular-shaped crop

how to create an image whick is filled with pieces of irregular-shaped images, it’s a good practice for me to handle it.

result

principle

bash

#!/bin/bash

input=$1  # source image
mask=$2   # mask image
output=$3 # target image

convert ${input} ${mask} -gravity Center -alpha Off -compose CopyOpacity -composite ${output}

summary

you can use a programming language (php,java...) whick use the imagck api to implement it.