ruby_spriter

https://github.com/scooter-indie/ruby-spriter

Ruby Spriter is a cross-platform tool for creating professional spritesheets from video files with advanced GIMP image processing. Features include edge-based and inner background removal, multi-threshold processing, ghost edge prevention, smoke detection, scaling with multiple interpolation methods, sharpening, batch processing, spritesheet consolidation, frame extraction, and comprehensive metadata management. Designed for game development workflows with Godot Engine.