image-diff
CLI tool for comparing images
Installation
Install this tool using pip:
$ pip install image-diff
Image diff
To generate an image showing the difference between two images:
image-diff first.jpg second.jpg -o diff.png
Count differing pixels
To count the number of pixels that have changed, use image-diff count:
image-diff first.jpg second.jpg
This will output a number followed by a newline.
Compile an image
The image-diff compile command exists mainly to make this tool easier to test.
It can be used to compile an image from a JSON definition – for example:
echo '[
[[0, 0, 0], [0, 0, 0], [0, 0, 0]],
[[0, 0, 0], [255, 0, 0], [0, 0, 0]],
[[0, 0, 0], [0, 0, 0], [0, 0, 0]]
]' | image-diff compile - -o one-pixel.png
Development
To contribute to this tool, first checkout the code. Then create a new virtual environment:
cd image-diff
python -m venv venv
source venv/bin/activate
Or if you are using pipenv:
pipenv shell
Now install the dependencies and test dependencies:
pip install -e '.[test]'
To run the tests:
pytest
