Convert PIL Image to byte array?

Question:

I have an image in PIL Image format. I need to convert it to byte array.

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

Now I need the roiImg as a byte array.

Asked By: Evelyn Jeba

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Answers:

Thanks everyone for your help.

Finally got it resolved!!

import io
from PIL import Image

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.

Answered By: Evelyn Jeba

This is my solution:

from PIL import Image
import io

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

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())
Answered By: Chris Ivan

Python file read and extract binary array

import base64
with open(img_file_name, "rb") as f:
    image_binary = f.read()
    base64_encode = base64.b64encode(image_binary)
    byte_decode = base64_encode.decode('utf8')
Answered By: yelran2003