The lightzone package has been broken for quite a long time. However, you can find a good deb for both Stable and Testing in the Suse OBS. Before installing the OBS version, you need to install the package
libjiconfont-google-material-design-icons-java_2.2.0.2-1_all.deb
This is not available in the Debian repositories, but you can download it from
https://launchpad.net/~lightzone-team/+archive/ubuntu/lightzone/+packages
So, the steps are:
1. Download and install libjiconfont-google-material-design-icons-java_2.2.0.2-1_all.deb
2. Download and install lightzone_5.0.0.beta2-1+210.5_amd64.deb for your version of Sparky from the Suse OBS
3. In a terminal type sudo apt-mark hold lightzone to prevent it being overwritten during updates.
Enjoy lightzone!
bazzvn
updated for stable and testing