Develop Reference

OSError: cannot identify image file 'file_name'

I have already read answer of this question Image.open() cannot identify image file - Python?, that question was solved by using from PIL import Image, but my situation is different. I am using image_slicer, and there I am getting these errors:
Traceback (most recent call last):
File "image_slice.py", line 17, in <module>
j=image_slicer.slice('file_name' , n_k)
File "/home/user_name/.local/lib/python3.5/site-
packages/image_slicer/main.py", line 114, in slice
im = Image.open(filename)
File "/home/user_name/.local/lib/python3.5/site-packages/PIL/Image.py", line 2687, in open
% (filename if filename else fp))
OSError: cannot identify image file 'file_name'
The full code is:
import os
from PIL import Image
import image_slicer
import numpy as np
import nibabel as nib
img = nib.load('/home/user_name/volume-20.nii')
img.shape
epi_img_data = img.get_data()
#epi_img_data.shape
n_i, n_j, n_k = epi_img_data.shape
center_i = (n_i - 1) // 2
center_j = (n_j - 1) // 2
center_k = (n_k - 1) // 2
centers = [center_i, center_j, center_k]
print("Co-ordinates in the voxel array: ", centers)
#for i in range(n_k):
j=image_slicer.slice('/home/user_name/volume-20.nii' , n_k)
However nib.load(), works fine, but image_slicer is not working.
All the nii images are 3D images.

Image slicer is not intended for reading nii format. Here is the list of supported formats.

This error also occurs whenever the image file itself is corrupted. I once accidentally was in the process of deleting the subject image, until canceling mid-way through.
TL;DR - open image file to see if it's ok.

Python Image to Text

i'm trying to write a python script that will take an image as an input and print out whatever is in the image as text to the terminal or a file. i do have python 2.7 and 3.7
i do have PIL and pytesseract install on my Kali linux
but i'm getting this errors
Traceback (most recent call last):
File "imgtotxt.py", line 8, in <module>
img =Image.open("/home/Desktop/ITT/1.jpeg")
File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2609, in open
fp = builtins.open(filename, "rb")
FileNotFoundError: [Errno 2] No such file or directory: '/home/Desktop/ITT/1.jpeg'
HERE IS MY CODE
#!/usr/bin/python
from PIL import Image
from pytesseract import image_to_string
img =Image.open("/home/Desktop/ITT/1.jpeg")
text =image_to_string(img)
print (text)

Something is wrong with how you typed the filename.
Try this in your python code:
import os
print(os.listdir("/home/Desktop/ITT/"))
You should see your filename printed. Copy the filename from there instead.
If this fails, go up a directory (eg /home/Desktop) and try that.

Make sure if the file exists at the exact location you specified. The system isn't finding the file. Perhaps it's at /home/YOUR_USER/Desktop/ITT/1.jpeg ?

Put the script in the same folder as is the image, change path to only a name of the image and you will se if something is REALLY wrong.
EDIT:
Try this then:
import cv2
import numpy as np
image = cv2.imread('1.jpeg') # alternativly /home/Desktop/ITT/
img = Image.fromarray(image.astype(np.uint8))
....
Also check if your image is not corrupted. This is pretty strange

Python PyMuPDF Fitz insertImage

Have been trying to put an image into a PDF file using PyMuPDF / Fitz and everywhere I look on the internet I get the same syntax, but when I use it I'm getting a runtime error.
>>> doc = fitz.open("NewPDF.pdf")
>>> page = doc[1]
>>> rect = fitz.Rect(0,0,880,1080)
>>> page.insertImage(rect, filename = "Image01.jpg")
error: object is not a stream
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\fitz\fitz.py", line 1225, in insertImage
return _fitz.Page_insertImage(self, rect, filename, pixmap, overlay)
RuntimeError: object is not a stream
>>> page
page 1 of NewPDF.pdf
I've tried a few different variations on this, with pixmap and without, with overlay value set, and without. The PDF file exists and can be opened with Adobe Acrobat Reader, and the image file exists - I have tried PNG and JPG.
Thank you in advanced for any help.

just some hints to attempt:
Ensure that your "Image01.jpg" file is open and use the full path.
image_path = "/full/path/to/Image01.jpg"
image_file = Image.open(
open(image_path, 'rb'))
# side-note: generally it is better to use the open with syntax, see link below
# https://stackoverflow.com/questions/9282967/how-to-open-a-file-using-the-open-with-statement
To ensure that you are actually on the pdf page that you expect to be, try this. This code will insert the image only on the first page
for page in doc:
page.InsertImage(rect, filename=image_path)
break # Without this, the image will appear on each page of your pdf

Error setting psm for pytesseract

I'm trying to use a psm of 0 with pytesseract, but I'm getting an error. My code is:
import pytesseract
from PIL import Image
img = Image.open('pathToImage')
pytesseract.image_to_string(img, config='-psm 0')
The error that comes up is
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/site-packages/pytesseract/pytesseract.py", line 126, in image_to_string
f = open(output_file_name, 'rb')
IOError: [Errno 2] No such file or directory:
'/var/folders/m8/pkg0ppx11m19hwn71cft06jw0000gp/T/tess_uIaw2D.txt'
When I go into '/var/folders/m8/pkg0ppx11m19hwn71cft06jw0000gp/T', there's a file called tess_uIaw2D.osd that seems to contain the output information I was looking for. It seems like tesseract is saving a file as .osd, then looking for that file but with a .txt extension. When I run tesseract through the command line with --psm 0, it saves the output file as .osd instead of .txt.
Is it correct that pytesseract's image_to_string() works by saving an output file somewhere and then automatically reading that output file? And is there any way to either set tesseract to save the file as .txt, or to set it to look for a .osd file? I'm having no issues just running the image_to_string() function when I don't set the psm.

You have a couple of questions here:
PSM error
In your question you mention that you are running "--psm 0" in the command line. However in your code snip you have "-psm 0".
Using the double dash, config= "--psm 0", will fix that issue.
If you read the tesseract command line documentation, you can specify where to output the text read from the image. I suggest you start there.
Is it correct that pytesseract's image_to_string() works by saving an output file somewhere and then automatically reading that output file?
From my usage of tesseract, this is not how it works
pytesseract.image_to_string() by default returns the string found on the image. This is defined by the parameter output_type=Output.STRING, when you look at the function image_to_string.
The other return options include (1) Output.BYTES and (2) Output.DICT
I usually have something like text = pytesseract.image_to_string(img)
I then write that text to a log file
Here is an example:
import datetime
import io
import pytesseract
import cv2
img = cv2.imread("pathToImage")
text = pytesseract.image_to_string(img, config="--psm 0")
ocr_log = "C:/foo/bar/output.txt"
timestamp_fmt = "%Y-%m-%d_%H-%M-%S-%f"
# ...
# DO SOME OTHER STUFF BEFORE WRITING TO LOG FILE
# ...
with io.open(ocr_log, "a") as ocr_file:
timestamp = datetime.datetime.now().strftime(timestamp_fmt)
ocr_file.write(f"{timestamp}:\n====OCR-START===\n")
ocr_file.write(text)
ocr_file.write("\n====OCR-END====\n")

Python file open from path containing numbers

i have the following problem during file open:
Using PyQt QFileDialog I get path for files from user which I would like to read it
def read_file(self):
self.t_file = (QFileDialog.getOpenFileNames(self, 'Select File', '','*.txt'))
Unfortunately I cannot open a file if the path has numbers in it:
Ex:
'E:\test\02_info\test.txt'
I tried
f1 = open(self.t_file,'r')
Could anyone help me to read files from such a path format?
Thank you in advance.
EDIT:
I get the following error:
Traceback (most recent call last):
File "<pyshell#27>", line 1, in <module>
f1 = open(self.t_file,'r')
IOError: [Errno 22] invalid mode ('r') or filename: 'E:\test\x02_info\test.txt'

The problem is caused by your use of getOpenFileNames (which returns a list of files) instead of getOpenFileName (which returns a single file). You also seem to have converted the return value wrongly, but since you haven't shown the relevant code, I will just show you how it should be done (assuming you are using python2):
def read_file(self):
filename = QFileDialog.getOpenFileName(self, 'Select File', '','*.txt')
# convert to a python string
self.t_file = unicode(filename)