#!/usr/bin/env python3
import sys
from PIL import Image

source, target, cap, quality = sys.argv[1], sys.argv[2], int(sys.argv[3]), int(sys.argv[4])
with Image.open(source) as image:
    image = image.convert('RGB')
    if len(sys.argv) == 9:
        x, y, width, height = [int(v) for v in sys.argv[5:9]]
        image = image.crop((x, y, x + width, y + height))
    scale = min(1.0, cap / max(image.width, image.height))
    if scale < 1.0:
        image = image.resize((round(image.width * scale), round(image.height * scale)), Image.Resampling.LANCZOS)
    image.save(target, 'WEBP', quality=quality, method=4)