**GrainyPy** is a set of functions for Python 3.4 or later that take high-quality images and make them look like rubbish. There are functions for applying various dithering algorithms, which reduce the bit depth of an image while trying to maintain an approximation of the original colours, and some other pixel-munging stuff. The low-level functionality is implemented in **grainyx**, which is written in C. The **grainy** higher-level wrapper provides an interface with the [Cairo](https://www.cairographics.org/) 2D graphics library, as well as other functionality that makes the operations easier to use. Installation is explained in the setup.py script. This module also requires Qahirah ([GitLab](https://gitlab.com/ldo/qahirah), [GitHub](https://github.com/ldo/qahirah)), my Cairo graphics wrapper, to be installed. Example code showing GrainyPy in action is available from the grainypy_examples ([GitLab](https://gitlab.com/ldo/grainypy_examples), [GitHub](https://github.com/ldo/grainypy_examples)) repo. Lawrence D'Oliveiro <ldo@geek-central.gen.nz> 2017 April 7