encode-decode-jpeg

from StringIO import StringIO
from PIL import Image
 
def encode_jpeg(img, quality=100):
  """Encode ndarray image into a jpeg
  Args:
    img: 3D (wxhxRGB) array
    quality: jpeg compression quality
  """
  s = StringIO()
  img = Image.fromarray(img)
  img.save(s, format="JPEG", quality=quality)
  return s
 
def decode_jpeg(string_data):
  """Decode jpeg byte into to a Image object"""
  return Image.open(string_data)