Dithering-OpenCV
'Floyd-Steinberg' dithering algorithm implementation in C++
See https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering for additional details.
Results
OpenCV 3.1.0 installation for OSX
After downloading the latest release from https://github.com/Itseez/opencv/archive/3.1.0.zip run the following commands in the terminal.
cmake -DWITH_IPP=ON -DINSTALL_CREATE_DISTRIB=ON . && make -j $(nproc)
sudo make install