Sketch a Masterpiece
Sketch a Masterpiece takes a line drawing — anything from a napkin doodle to clean line art — and uses it as a structural skeleton for a generation. ControlNet reads the strokes, the main model paints inside them. You decide what the strokes become through the prompt.
It's the fastest path on Pocket from "I have a vague composition in my head" to "I have an image that follows that composition."
#What it does
Pocket ships four preprocessor/model pairs so the underlying ControlNet can match the kind of input you have:
- Scribble — freehand drawings, loose scribbles, kid-style art. Most forgiving.
- LineArt — clean line art of any subject. Translates to any style.
- LineArt Anime — tuned for manga and anime lines.
- Canny — works from outlines. Best with an inverted reference (white lines on black).
The mode is the same idea every time: the model preserves geometry, you reinterpret texture, lighting, color, and style through the prompt.
#How to start
- Open the Advanced Guidance panel and tap Sketch a Masterpiece. Pocket opens a sketch canvas.
- Either draw directly on the canvas, paste an image from your library, or capture a sketch with the camera.
- Pick the ControlNet variant that matches your input (Scribble for rough lines, LineArt for cleaner work, Canny for outline-style images).
- Write a prompt that describes the look — lighting, materials, color palette, style — not the layout. The sketch already covers layout.
- Generate.
#Conditioning strength
ControlNet strength controls how strictly the result has to follow the sketch:
- Above 80% — geometry is locked. Good for storyboard frames where pose must match.
- 60–80% — balanced. The model can soften awkward proportions while keeping the composition.
- Below 60% — the sketch becomes a loose suggestion. Useful when your lines are very rough.
#Prompt tips
- Describe lighting and style separately from structure. "Oil painting, warm rim light, golden hour" — not "a person standing." The sketch is "a person standing."
- Style triggers help. Adding a Sogni style (or a strong artist/medium reference) gives the model a clear target.
- Push steps up. 30+ steps consistently gives ControlNet work more headroom than the default.
- Try inverting the canvas. The Invert button (bottom-right) flips white-on-black to black-on-white. Different preprocessors prefer different polarities, and the result can change dramatically.
- Line width matters. Thick strokes read as solid shapes; thin strokes read as edges. Adjust the brush before drawing.
#What is preserved vs reinterpreted
| Preserved | Reinterpreted |
|---|---|
| Geometry, silhouettes, composition | Texture, materials, surface detail |
| Pose, framing, perspective lines | Lighting, color palette, mood |
| Number and rough position of subjects | Style (photoreal, painterly, anime, etc.) |
If the sketch has a face, the position and proportions of the face carry over — but not the identity. Use Face Transfer for that.
#Workflows
Napkin sketch to concept art. Rough out a thumbnail on the canvas, set strength to 65%, prompt for a moody concept-art style, generate a batch.
Kid's drawing to storybook page. Photograph the drawing, run it through Scribble at high strength, prompt for "children's book illustration, watercolor, soft light."
Storyboard pass. Sketch each frame at a consistent style. Use the same prompt across frames so only the geometry changes.
Logo or icon ideation. Sketch a silhouette, switch to Canny, prompt for the material (chrome, neon, paper-craft) you want to test.
#Tips
- A clean, high-contrast sketch outperforms a detailed one. Edges matter more than fills.
- If results ignore the sketch, raise strength. If results look traced, lower it.
- Avoid prompting for "a sketch of …" — the model will draw a sketch on top of your sketch.