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How to change one part of a picture and keep the rest with HEISS UI

Paint over an area of a reference or start image and describe what it should become.

Short answer: Add a reference or start image in the prompt bar, or use one from the library; then Hover the image and press the brush to open inpainting; Paint over the part that should change, then write what it becomes. All steps.

  • Content
  • Beginner
  • 30 minutes
  • From the README
  • Any agent

Authorization notice. HEISS UI is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA creator with a generated or uploaded picture that is nearly right except for one area.

The problemRegenerating a whole picture loses the parts that already worked.

The outcomeOnly the painted part is redrawn, and the rest of the picture stays as it was.

What you need first

  • A ComfyUI install that is running, such as ComfyUI Desktop, or reachable at a known address
  • A Windows, macOS (Apple Silicon) or Linux computer, or Node.js 20.9+ if you install from source
  • Enough disk space for the model files you choose to download

Steps

  1. Add a reference or start image in the prompt bar, or use one from the library.
  2. Hover the image and press the brush to open inpainting.
  3. Paint over the part that should change, then write what it becomes.
  4. Adjust Inpaint strength and Edge softness in the sidebar if the edge looks wrong, then run it.

Prompt for your agent

In the HEISS-UI studio (github.com/tristmeister/HEISS-UI), open the image <image name> from the gallery, paint a mask over <area description>, and set the prompt to <replacement description>. Report the output image path and confirm that the unpainted area is unchanged. Verify that the selected model is one of the 18 image families that inpaint.

Caveat. Inpainting is in beta, is not available for Ideogram 4, MageFlow, Sana, video or imported workflows, and the model menu marks which families support it.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for tristmeister/HEISS-UI and "Change one part of a picture and keep the rest"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

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