Open Source Digital Painting for Linux

Lumi-o is designed for layered raster painting, deliberately lean and stable. Wacom tablet support delivers the smooth, responsive input professional illustration demands.

Lumi’s palette-driven color system mixes real-world pigment profiles spectrally. Build palettes around visualized color relationships, control tonal value, and organize colors as named entries. The Palette Map and Mixer help keep color decisions coherent across a painting or project.

Built on GIMP’s core architecture, Lumi-o is designed and refined by an artist. Its tools stay approachable while offering the customization needed for advanced workflows. Fast loading and saving, plus a fully integrated autosave system, protect your work without interrupting your flow.

Lazy loading lets Lumi open large, complex projects using far less RAM. When a group is collapsed, Lumi loads its saved composite image while its layers, masks, and nested groups remain lightweight placeholders until expanded.

Lumi-o is developed on Debian 13 with the Cinnamon desktop. If you’re coming from Windows, installing Debian is the first step. See How to Install Linux.