GraphicsMagick i Webp za pretvorbu slika

GraphicsMagick (slika.png mora biti u $HOME):
sudo apt install graphicsmagick
gm convert slika.png slika.webp
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Webp (mapa, sve u WebP format):
sudo apt install webp
for file in images/*; do cwebp "$file" -o "${file%.*}.webp"; done