ComfyUI-Whiteboard

A simple ComfyUI node that creates a white canvas for freehand drawing and automatically runs inference. Designed to be used in both img2img and sketch-to-image workflows (with ControlNet guidance).

Features

• Draw freely on a white canvas with adjustable brush size and color.
• Optional Auto Run mode: the node automatically triggers inference as you draw.
• Works as a control image for ControlNet-compatible nodes (sketch-to-image and img2img workflows).
• Lightweight and easy to integrate into existing ComfyUI flows.

Installation

• Place the ComfyUi-Whiteboard folder inside your ComfyUI custom_nodes directory.
• Restart ComfyUI.

Basic Usage

• Add the Whiteboard node to your graph.
• Draw on the canvas using the built-in drawing tools.
• Toggle Auto Run if you want inference to run automatically while drawing.

Using with img2img

• Connect your source image into your usual Img2Img pipeline.
• Connect the Whiteboard output to a ControlNet node's image input (or to any node that accepts a control image).
• Adjust denoising/strength settings on the Img2Img node to control how strongly your sketch influences the output.

Sketch-to-Image (ControlNet) Workflow

• Place the Whiteboard node and draw the desired sketch.
• Add a ControlNet node and connect the Whiteboard output to the ControlNet's image input.
• Connect ControlNet to your main sampler (txt2img or img2img) and configure weights/conditioning as needed.

Tips

• Use thicker brush strokes for stronger guidance in ControlNet.
• Try Auto Run off when making broad changes to avoid many automatic inferences.
• Combine the Whiteboard output with other control images (depth, canny, etc.) for richer effects.