Core Idea

ComfyUI represents image generation as a graph of connected nodes. Each node performs one part of the process, and each connection passes a specific type of data to the next stage. The interface becomes manageable once the graph is understood as a visible pipeline rather than a collection of unrelated boxes.

The standard text-to-image pipeline has six functional stages:

1. Load a checkpoint.
2. Encode a positive prompt.
3. Encode a negative prompt.
4. Create an empty latent image.
5. Sample the latent representation with a KSampler.
6. Decode the latent result and preview or save the image.