You have a rough sketch. A pencil drawing. A quick doodle. You want to see it as a finished, fully rendered image.
Sketch in. Full scene out.
Run it now on Floyo!
How It Works
Upload your sketch. Write a prompt describing what you want the final image to look like. ControlNet reads the lines and structure from your sketch and uses them to guide the generation. The AI fills in color, lighting, texture, and detail while following your composition.
Three controls let you decide how closely the output follows your sketch versus how much creative freedom the AI gets.
Key Inputs
Sketch Image
Any JPG or PNG. Pencil sketches, line art, rough doodles, and digital drawings all work. The clearer the lines and the more readable the composition, the better the output follows your intent.
Works well with:
character and figure sketches
environment and scene layouts
architectural and interior rough drawings
product and object concept sketches
storyboard panels
Works less well with:
very faint or low-contrast pencil marks
extremely loose scribbles with no clear structure
sketches with heavy cross-hatching that confuses edge detection
Prompt
Describe the final image as specifically as possible. Include style, lighting, mood, materials, and setting. The prompt fills in everything your sketch doesn't specify.
Examples:
"a young knight standing in an autumn forest, cinematic lighting, detailed armor, painterly illustration style""cozy coffee shop interior, warm afternoon light, wooden furniture, soft bokeh, photorealistic""futuristic cityscape at night, neon lights reflecting on wet streets, wide shot, cinematic""product concept render, white background, studio lighting, clean industrial design"
Width and Height
Set in pixels. Match the aspect ratio of your sketch for the most accurate layout transfer. Standard resolutions like 1024x1024, 832x1216, or 1216x832 work well.
ControlNet Strength
Controls how closely the output follows your sketch's lines and structure.
Low (0.3–0.5): loose interpretation, AI takes creative license with the composition
Mid (0.6–0.8): balanced, sketch structure guides the output without locking it down
High (0.9–1.0): strict adherence, output closely follows every line in your sketch
Start at 0.7. Raise it if the AI is ignoring your composition. Lower it if the output feels too rigid.
Start Percent
The point in the generation process where ControlNet begins influencing the output. Default is 0.0 (from the very beginning).
Raise it (try 0.2–0.3) to let the AI imagine freely first before your sketch starts guiding it. This produces more creative interpretations that still loosely follow your structure.
End Percent
The point where ControlNet stops influencing the output. Default is 1.0 (all the way to the end).
Lower it (try 0.7–0.8) to let the AI finish the image with its own variation after your sketch has set the composition. Produces softer, more natural-feeling results.
What This Is Great For
Concept art and ideation: Sketch a rough layout and generate multiple fully rendered interpretations instantly. Fast creative exploration without committing to a final render.
Storyboarding: Turn rough panel sketches into finished scene illustrations for film, animation, and comic pre-production.
Architecture and interior design: Sketch a floor plan or room layout and render it as a realistic or stylized visual for client presentations.
Character design: Sketch a character and generate multiple rendered versions with different styles, lighting, and color treatments from the same base drawing.
Product concepting: Rough out a product shape and generate photo-realistic renders for early-stage concept reviews.
What to Watch Out For
Very faint or low-contrast sketches give ControlNet less to work with. If your sketch isn't registering, increase the contrast before uploading or darken your lines.
ControlNet Strength above 0.9 locks the output tightly to your sketch, including any mistakes or rough lines. Lower the strength if the output looks too mechanical or is following unwanted marks.
Start and End Percent work together. A later start with an earlier end gives the AI more freedom at both stages of generation. A 0.0 start with 1.0 end gives ControlNet maximum influence throughout. Experiment with both to find the right balance for your sketch style.
Prompt quality matters as much as sketch quality. A vague prompt with a detailed sketch produces a vague result. Describe the final image specifically style, lighting, materials, and mood all make a difference.