Image.Open() Cannot Identify Image File - Python

Image.open() cannot identify image file - Python?

I had a same issue.

from PIL import Image

instead of

import Image

fixed the issue

UnidentifiedImageError: cannot identify image file

Try this function to check if the image are all in correct format.

import os
from PIL import Image
folder_path = 'data\img'
extensions = []
for fldr in os.listdir(folder_path):
    sub_folder_path = os.path.join(folder_path, fldr)
    for filee in os.listdir(sub_folder_path):
        file_path = os.path.join(sub_folder_path, filee)
        print('** Path: {}  **'.format(file_path), end="\r", flush=True)
        im = Image.open(file_path)
        rgb_im = im.convert('RGB')
        if filee.split('.')[1] not in extensions:
            extensions.append(filee.split('.')[1])
    

Image.open gives error Cannot identify image file

You have a multi-channel 32-bit TIFF image, and Pillow doesn't yet support that format. See issue #1888:

Pillow (and PIL) is currently able to open 8 bit per channel multi-channel images (such as RGB) but is able to open higher bit depth images (e.g. I16, I32, or Float32 images) if they are single channel (e.g., grayscale).

[...]

Requirements

• We should be able to support common GIS formats as well as high bit depth RGB(A) images.
• At least 4 channels, but potentially more (see #1839)
• Different pixel formats, including I16, I32, and Float.

I determined this by using the TIFF plugin image reader directly, with debug mode enabled:

from PIL import TiffImagePlugin
TiffImagePlugin.DEBUG = True
with open(image_path, 'rb') as f:
    TiffImagePlugin.TiffImageFile(f)

which includes the output:

tag: BitsPerSample (258) - type: short (3) Tag Location: 46 - Data Location: 218 - value: (32, 32, 32)

(full debug output below)

You can use the Python GDAL bindings to read this format. You can also use the gdal_translate command line utility to convert your files to a format that Pillow can handle; for multiband, you'd have to go down to 8 bits, or move to grayscale.

For example, to translate your input file to PNG, you can use:

gdal_translate -of PNG rgb_CGI.tiff rgb_CGI.png

after which Pillow can open the PNG file.

---

Full debug output from Pillow's TIFF plugin:

>>> from PIL import TiffImagePlugin
>>> TiffImagePlugin.DEBUG = True
>>> with open(image_path, 'rb') as f:
...     TiffImagePlugin.TiffImageFile(f)
...
*** TiffImageFile._open ***
- __first: 8
- ifh:  b'II*\x00\x08\x00\x00\x00'
Seeking to frame 0, on frame -1, __next 8, location: 8
Loading tags, location: 8
tag: ImageWidth (256) - type: short (3) - value: 2924
tag: ImageLength (257) - type: short (3) - value: 2088
tag: BitsPerSample (258) - type: short (3) Tag Location: 46 - Data Location: 218 - value: (32, 32, 32)
tag: Compression (259) - type: short (3) - value: 1
tag: PhotometricInterpretation (262) - type: short (3) - value: 1
tag: StripOffsets (273) - type: long (4) Tag Location: 82 - Data Location: 8576 - value: <table: 8352 bytes>
tag: SamplesPerPixel (277) - type: short (3) - value: 3
tag: RowsPerStrip (278) - type: short (3) - value: 1
tag: StripByteCounts (279) - type: long (4) Tag Location: 118 - Data Location: 224 - value: <table: 8352 bytes>
tag: PlanarConfiguration (284) - type: short (3) - value: 1
tag: ExtraSamples (338) - type: short (3) - value: (0, 0)
tag: SampleFormat (339) - type: short (3) Tag Location: 154 - Data Location: 16928 - value: (2, 2, 2)
tag: ModelPixelScaleTag (33550) - type: double (12) Tag Location: 166 - Data Location: 16934 - value: (0.25, 0.25, 0.0)
tag: ModelTiepointTag (33922) - type: double (12) Tag Location: 178 - Data Location: 16958 - value: <table: 48 bytes>
tag: GeoKeyDirectoryTag (34735) - type: short (3) Tag Location: 190 - Data Location: 17006 - value: <table: 72 bytes>
tag: GeoDoubleParamsTag (34736) - type: double (12) Tag Location: 202 - Data Location: 17078 - value: <table: 56 bytes>
tag: GeoAsciiParamsTag (34737) - type: string (2) Tag Location: 214 - Data Location: 17134 - value: Amersfoort / RD New|Amersfoort|
tag: ImageWidth (256) - type: short (3) - value: 2924
tag: ImageLength (257) - type: short (3) - value: 2088
tag: BitsPerSample (258) - type: short (3) Tag Location: 46 - Data Location: 218 - value: (32, 32, 32)
tag: Compression (259) - type: short (3) - value: 1
tag: PhotometricInterpretation (262) - type: short (3) - value: 1
tag: StripOffsets (273) - type: long (4) Tag Location: 82 - Data Location: 8576 - value: <table: 8352 bytes>
tag: SamplesPerPixel (277) - type: short (3) - value: 3
tag: RowsPerStrip (278) - type: short (3) - value: 1
tag: StripByteCounts (279) - type: long (4) Tag Location: 118 - Data Location: 224 - value: <table: 8352 bytes>
tag: PlanarConfiguration (284) - type: short (3) - value: 1
tag: ExtraSamples (338) - type: short (3) - value: (0, 0)
tag: SampleFormat (339) - type: short (3) Tag Location: 154 - Data Location: 16928 - value: (2, 2, 2)
tag: ModelPixelScaleTag (33550) - type: double (12) Tag Location: 166 - Data Location: 16934 - value: (0.25, 0.25, 0.0)
tag: ModelTiepointTag (33922) - type: double (12) Tag Location: 178 - Data Location: 16958 - value: <table: 48 bytes>
tag: GeoKeyDirectoryTag (34735) - type: short (3) Tag Location: 190 - Data Location: 17006 - value: <table: 72 bytes>
tag: GeoDoubleParamsTag (34736) - type: double (12) Tag Location: 202 - Data Location: 17078 - value: <table: 56 bytes>
tag: GeoAsciiParamsTag (34737) - type: string (2) Tag Location: 214 - Data Location: 17134 - value: Amersfoort / RD New|Amersfoort|
*** Summary ***
- compression: raw
- photometric_interpretation: 1
- planar_configuration: 1
- fill_order: 1
- size: (2924, 2088)
format key: (b'II', 1, (2, 2, 2), 1, (32, 32, 32), (0, 0))
- unsupported format
Traceback (most recent call last):
  File "/Users/mjpieters/Development/venvs/stackoverflow-3.6/lib/python3.6/site-packages/PIL/TiffImagePlugin.py", line 1196, in _setup
    self.mode, rawmode = OPEN_INFO[key]
KeyError: (b'II', 1, (2, 2, 2), 1, (32, 32, 32), (0, 0))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mjpieters/Development/venvs/stackoverflow-3.6/lib/python3.6/site-packages/PIL/ImageFile.py", line 102, in __init__
    self._open()
  File "/Users/mjpieters/Development/venvs/stackoverflow-3.6/lib/python3.6/site-packages/PIL/TiffImagePlugin.py", line 950, in _open
    self._seek(0)
  File "/Users/mjpieters/Development/venvs/stackoverflow-3.6/lib/python3.6/site-packages/PIL/TiffImagePlugin.py", line 1017, in _seek
    self._setup()
  File "/Users/mjpieters/Development/venvs/stackoverflow-3.6/lib/python3.6/site-packages/PIL/TiffImagePlugin.py", line 1200, in _setup
    raise SyntaxError("unknown pixel mode")
SyntaxError: unknown pixel mode

PIL.UnidentifiedImageError: cannot identify image file (when reading 4 band .tif image)

Your image is 4-channels of 32-bits each. PIL doesn’t support such images - see Available Modes here.

I would suggest tifffile or OpenCV’s cv2.imread(…, cv2.IMREAD_UNCHANGED)

Cannot identify image file '/tmp/image.png'

# define local path to save image
TEMP_FILE = '/tmp/image.png'

# In a notebook, run bash command to download image locally from URL
!wget -q -O $TEMP_FILE $INPUT_IMAGE_URL

# Open the image (with Pillow library most likely)
im = Image.open(TEMP_FILE)

# Resize it to 512*512 pixels with the antialiasing resampling algorithm 
im.thumbnail((512, 512), Image.ANTIALIAS)

# Save output image to local file
im.save(TEMP_FILE, 'PNG')

---

Related Topics