import os
import PIL.Image

def save_image(arr, fp, format='JPEG'):
    image = PIL.Image.fromarray(arr)
    image.save(fp, format=format, quality=90)

def save_images(ims, output_dir='', prefix='', format='JPEG'):
    for i, im in enumerate(ims):
        full_path = os.path.join(output_dir, prefix + str(i).zfill(4) + '.' + format.lower())
        save_image(im, full_path, format)