Create thumbs from image

image_to_thumbs.py

import cv2

def image_to_thumbs(img):
    """Create thumbs from image"""
    height, width, channels = img.shape
    thumbs = {"original": img}
    sizes = [640, 320, 160]
    for size in sizes:
        if (width >= size):
            r = (size + 0.0) / width
            max_size = (size, int(height * r))
            thumbs[str(size)] = cv2.resize(img, max_size, interpolation=cv2.INTER_AREA)
    return thumbs