Excel art generator
Using PIP
$ pip install xlart
Using setup
$ python setup.py install
xlart image.png destination.xlsx
You can control the downsampling with the --scale argument.
# output 1 cell for every 3 pixels of the image
xlart image.png destination.xlsx --scale=3
If you have problems installing Pillow on macOS try this, then try installing again.
pip install --upgrade pip
pip install Pillow