Rebuilding Ruby’s Image Processing Layer: Why ruby-libgd Matters for GIS and the Future of Ruby

In late 2025, during a RubyConf presentation about disaster-response systems, an uncomfortable truth was stated publicly: Generating map tiles and images on the server is difficult in Ruby. RMagick and MiniMagick were too slow. ruby-gd is used, but it is poorly maintained. This was not a theoretical complaint. It came from a team building real-world GIS infrastructure — map tiles, overlays, and image generation for emergency and disaster response. And they were right. Ruby has lost its graphics runtime. That realization is what led to the creation of ruby-libgd.