Rotate pictures according to EXIF orientation tag, in python using PIL. Supports all 8 orientations with a simple transposition operation.

exif_rotate.py

# Proper exif rotation with PIL. Handles all the cases in https://github.com/recurser/exif-orientation-examples
from PIL import Image

image = Image.open(filename)
exif = image._getexif()
ORIENTATION = 274
if exif is not None and ORIENTATION in exif:
    orientation = exif[ORIENTATION]
    method = {2: Image.FLIP_LEFT_RIGHT, 4: Image.FLIP_TOP_BOTTOM, 8: Image.ROTATE_90, 3: Image.ROTATE_180, 6: Image.ROTATE_270, 5: Image.TRANSPOSE, 7: Image.TRANSVERSE}
    if orientation in method:
        image = image.transpose(method[orientation])
 image.show()