Make kongz images without background Commands to run before (using 4000 as the maximum id for now, babies still being born): mkdir assets cd assets mkdir metadata cd metadata for i in $(seq 1 4000) do wget "https://kongz.herokuapp.com/api/metadata/$i" sleep 1 done cd .. mkdir images for i in $(seq 1 4000) do wget -c "$(cat metadata/$i | jq -r .image)" -O images/$i sleep 2 done mkdir images-nobg Then: go run cmd/kongzbg/main.go