gem-plugin-sgi 1:0.93.3-12 (arm64 binary) in ubuntu bionic

 Gem is a loadable library for Pure Data (Pd), which adds OpenGL graphics
 rendering and animation to Pd. Pd is a graphical programming language and
 computer music system.
 .
 This package provides image loading for SGI images.
 If you have installed the gem-plugin-magick package as well, you might find
 that you don't need this package as you can already read and write(!) SGI
 images.