*This is a first alpha release for testing this new version of nip. Don't use it for anything serious!* nip4 is a GUI for the libvips image processing library. It's a little like a spreadsheet: you create a set of formula connecting your objects together, and on a change nip2 will recalculate. This makes it convenient for developing image processing systems since you can watch pixels change as you adjust your equations. Because nip4 uses libvips as the image processing engine it can handle very large images and only needs a little memory. It scales to fairly complex workflows: I've used it to develop systems with more than 10,000 cells, analyzing images of many tens of gigabytes. It has a batch mode, so you can run any image processing system you develop from the command-line and without a GUI.