GlossaryFoundations

Diffusion

Diffusion models generate images (and sometimes video) by iteratively refining random noise into coherent visuals guided by a text prompt.

Most consumer image AI (Midjourney, DALL·E, Stable Diffusion) uses diffusion, which behaves differently from chat LLMs in latency, controls, and failure modes.

What it means

A diffusion model denoises step-by-step from noise to pixels, conditioned on your prompt and settings like aspect ratio, style, or reference image.

Why designers should care

Image UX needs progress for multi-second runs, seed/history for reproducibility, negative prompts or filters, and clear rights or safety messaging on outputs.

Example

A marketing tool generates ad variants from a brief; users see step progress, pick from four thumbnails, edit prompt, and regenerate one slot without rerunning the whole batch.

Common mistakes

  • Treating image generation like instant chat with no wait or cancel states.
  • No gallery/history when outputs are non-deterministic and users need to compare runs.
  • Hiding that diffusion can produce artifacts, wrong text, or off-brand visuals without review.

Frequently asked questions

What is Diffusion?

Diffusion models generate images (and sometimes video) by iteratively refining random noise into coherent visuals guided by a text prompt.

Why should designers care about Diffusion?

Image UX needs progress for multi-second runs, seed/history for reproducibility, negative prompts or filters, and clear rights or safety messaging on outputs.

What are common mistakes with Diffusion?

Treating image generation like instant chat with no wait or cancel states; No gallery/history when outputs are non-deterministic and users need to compare runs; Hiding that diffusion can produce artifacts, wrong text, or off-brand visuals without review.

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