Convert PIL Image to byte array?

This is my solution. Please use this function.

from PIL import Image
import io

def image_to_byte_array(image: Image) -> bytes:
  # BytesIO is a fake file stored in memory
  imgByteArr = io.BytesIO()
  # image.save expects a file as a argument, passing a bytes io ins
  image.save(imgByteArr, format=image.format)
  # Turn the BytesIO object back into a bytes object
  imgByteArr = imgByteArr.getvalue()
  return imgByteArr

Thanks everyone for your help.

Finally got it resolved!!

import io

img = Image.open(fh, mode='r')
roi_img = img.crop(box)

img_byte_arr = io.BytesIO()
roi_img.save(img_byte_arr, format='PNG')
img_byte_arr = img_byte_arr.getvalue()

With this i don't have to save the cropped image in my hard disc and I'm able to retrieve the byte array from a PIL cropped image.

I think you can simply call the PIL image's .tobytes() method, and from there, to convert it to an array, use the bytes built-in.

#assuming image is a flattened, 3-channel numpy array of e.g. 600 x 600 pixels
bytesarray = bytes(Image.fromarray(array.reshape((600,600,3))).tobytes())