Coloring Stage Overview: API or Local GPU

The Coloring stage produces colored versions of your line-art pages. These aren’t for the book interior (readers color that themselves) — they’re for everything that sells the book: the cover, marketing previews, and the coloring timelapse videos.

Two Ways to Color

On first visit, a dialog asks “How would you like to create your coloring pages?”:

• Generate with API — cloud AI colorizes your sketches using the Color Prompts from your plan. This is the standard path; it uses your AI credits like sketch generation. Tabs: Colorize → Process → Finalize.
• Generate with GPU (Experimental) — a local coloring model runs on your own graphics card, with no per-image API cost. Requires a one-time ~3.7 GB model download. Tabs: Make → Process → Select → Finalize.

A Remember my choice checkbox saves your pick; you can change modes later per project.

Both paths converge on the same flow: color the pages (Colorize), rework them into a real-marker look (Process), and pick the final set (Finalize).

Prerequisite

Coloring works from your processed sketches, so finish the Sketch stage first. If you jump ahead, the app tells you exactly what’s missing (e.g., “Binary sketch images aren’t ready yet — finish the Sketch stage first.”).