# ref: https://blender.stackexchange.com/questions/270924/how-to-open-blenders-image-using-pillow
# ref: https://stackoverflow.com/questions/21233946/pil-image-save-function-fails-in-blender-python
import bpy
import os
import subprocess
import sys
import io
import struct
import numpy as np

try:
    from PIL import Image
except: 
    python_exe = os.path.join(sys.prefix, 'bin', 'python.exe')
    subprocess.call([python_exe, '-m', 'ensurepip'])
    subprocess.call([python_exe, '-m', 'pip', 'install', '--upgrade', 'pip'])
    subprocess.call([python_exe, '-m', 'pip', 'install', '--upgrade', 'pillow'])
    
def pil_to_image(pil_image, name='NewImage'):
    width, height = pil_image.width, pil_image.height
    normalized = 1.0 / 255.0
    bpy_image = bpy.data.images.new(name, width=width, height=height)
    bpy_image.pixels[:] = (np.asarray(pil_image.convert('RGBA'),dtype=np.float32) * normalized).ravel()
    return bpy_image

def image_to_pil(bpy_image):
    img = bpy_image
    pixels = [int(px * 255) for px in bpy_image.pixels[:]]
    bytes = struct.pack("%sB" % len(pixels), *pixels)
    pil_image = Image.frombytes('RGBA', (bpy_image.size[0], bpy_image.size[1]), bytes)
    return pil_image

im = image_to_pil(bpy.data.images["test"])
im = im.transpose(Image.FLIP_LEFT_RIGHT).rotate(45)
pil_to_image(im)