import base64
import io

import numpy as np
import PIL.Image


def img_b64_to_arr(img_b64):
    f = io.BytesIO()
    f.write(base64.b64decode(img_b64))
    img_arr = np.array(PIL.Image.open(f))
    return img_arr


def img_arr_to_b64(img_arr):
    img_pil = PIL.Image.fromarray(img_arr)
    f = io.BytesIO()
    img_pil.save(f, format='PNG')
    img_bin = f.getvalue()
    if hasattr(base64, 'encodebytes'):
        img_b64 = base64.encodebytes(img_bin)
    else:
        img_b64 = base64.encodestring(img_bin)
    return img_b64