PIL cannot identify image file for io.BytesIO object

Question

I am using the Pillow fork of PIL and keep receiving the error

OSError: cannot identify image file <_io.BytesIO object at 0x103a47468>

Answer 1

On some cases the same error happens when you are dealing with a Raw Image file such CR2. Example: http://www.rawsamples.ch/raws/canon/g10/RAW_CANON_G10.CR2

when you try to run:

byteImg = Image.open("RAW_CANON_G10.CR2")

You will get this error:

OSError: cannot identify image file 'RAW_CANON_G10.CR2'

So you need to convert the image using rawkit first, here is an example how to do it:

from io import BytesIO
from PIL import Image, ImageFile
import numpy
from rawkit import raw
def convert_cr2_to_jpg(raw_image):
    raw_image_process = raw.Raw(raw_image)
    buffered_image = numpy.array(raw_image_process.to_buffer())
    if raw_image_process.metadata.orientation == 0:
        jpg_image_height = raw_image_process.metadata.height
        jpg_image_width = raw_image_process.metadata.width
    else:
        jpg_image_height = raw_image_process.metadata.width
        jpg_image_width = raw_image_process.metadata.height
    jpg_image = Image.frombytes('RGB', (jpg_image_width, jpg_image_height), buffered_image)
    return jpg_image

byteImg = convert_cr2_to_jpg("RAW_CANON_G10.CR2")

Code credit if for mateusz-michalik on GitHub (https://github.com/mateusz-michalik/cr2-to-jpg/blob/master/cr2-to-jpg.py)