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Pick One Image Out of an Image List — By Index

Given a list of images (from a batch node, a multi-output model, or any collection-producing tool), grab the single image you want by its 0-based index. Slide to the position, extract, done. Perfect for picking a specific frame from a batch, a specific mask from a segmentation result, a specific variant from an image generator, or any "give me item N from this list" workflow.

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What it does

List Extract takes an image list as input and returns a single image at the position you specify. Indexing is 0-based — so 0 is the first image, 1 is the second, and so on. Use the slider (or type the value) to pick which one. The rest of the list is discarded; only the selected image passes through to downstream nodes.

Problem it solves

• Pick one image from a batch – Grab the specific output you want from a multi-image node without processing the whole list
• Post-process a multi-output model – Many models (segmentation, generation, edit) return multiple candidate images; List Extract lets you pick one for downstream work
• Isolate a segmentation mask – Extract just one mask from a stack (e.g., SAM3 returns multiple object masks — pick the one you care about)
• Choose a generation variant – Many image generators return several variants per run; grab the winner
• Bridge list-producing nodes to single-image nodes – Downstream nodes that expect one image (upscalers, blurs, viewers) can't consume a list — List Extract adapts the shape
• Iterate deterministically – Same index = same image every run, so results are reproducible
• Combine with Text Compare / Image Compare – Extract multiple items to different indices and feed them side-by-side into comparison tools

Input/Output

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• Input: Image list
  • Format: A collection of images produced by any list-emitting upstream node (batch generators, segmentation models with multiple masks, video-frame extractors, multi-variant image generators, etc.)
  • Size: Any number of images (2, 4, 10, 100+)

• Output: Single image

  • Format: Whatever format the original list items use (PNG / JPEG / RGBA)

  • Content: Exactly the image at the requested 0-based index

  • Resolution: Native — the image is passed through unchanged

    

    (example: extracting the layer 0 image from the QWEN-Layered node’s 4-layer image output)

• Configuration Option:
  • 0-based index of the image to extract: Which item to pull out of the list.
    • Range: 0 to (list length – 1)
    • 0 – First image in the list
    • N – The (N+1)th image
    • UI: A slider you drag to the position; the current index is shown to the right (starts at 0)
    • Behavior: Requesting an index past the end of the list will either return an error or nothing, depending on upstream node behavior — safest to stay within the list's range </aside>

How to Use

1. Connect an image-list source → Wire an upstream node that produces a list of images (segmentation model with multiple masks, batch generator, etc.) into List Extract
2. Set the index → Drag the slider (or type a value) to select which image you want. Remember: 0 = first image.
3. Run Flow → The selected image is emitted; downstream nodes receive that single image