nip2 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 nip2 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.
You can probably install nip2 via your package manager. For Windows and OS X, you can download a binary from the nip2 releases page. If you have to build from source, see the section below.
nip2 comes with a 50-page manual --- press F1 or Help / Contents in the program to view it.
In the nip2 directory you should just be able to do the usual:
./configure
make
sudo make install
By default this will install files to /usr/local. Check the summary at the
end of configure and make sure you have all of the features you want.
If you downloaded from GIT you'll need:
./autogen.sh
first to build the configure system.
nip2 needs vips, gtk2 and libxml2 at runtime and flex/bison at compile time. If you have fftw3, gsl, goffice, libgvc you get extra features.
Rebuild snap with:
snapcraft cleanbuild
Though it's done automatically on a push.