can somebody give me a code example how to read and write a Anvil file:
cv2.imread(?) an Anvil image file
cv2.imwrite(?) an Anvil image file
I have some old app where I was tinkering with cv2.
Take a look and you should be able to find what you are looking for.
You can use this image as a reference -
The logic was clunky but the idea was to find the stitches on the image and mark them with red color for later manipulation.
Outcome:
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I found also some other example I had for playing with cv2 and tesseract for some OCR capabilities
For best results just upload an image that have the text, for example some plate numbers of the car, etc.
Test image -
Thank you very much. I will give it a try. 
Thank you again, I tried it and it is working fine. 
Cool, glad I was able to help you!