Preview Image Without Metadata (fsdymy)

Let's be direct about this one: it's the sibling of the pack's SaveImageWithoutMetadata, and the name is doing more work than the node is. ComfyUI's built-in PreviewImage already shows you the image without writing anything permanent - it dumps a temp file into the temp directory, shows the preview, and that's it. So a "preview without metadata" node is solving a problem the core node mostly already doesn't have. If that sounds redundant, it is. It's here because the pack's author wanted the pair, and for a utility pack that's fine.

What it does

Look at the source and you'll see PreviewImageWithoutMetadata is literally a subclass of SaveImageWithoutMetadata with the knobs changed. It writes to ComfyUI's temp folder with a random five-character prefix, uses compression level 1 (fast, since nobody keeps these files), and saves with pnginfo=None - so not even the temp copy carries your workflow JSON.

The single input is images (IMAGE). No filename prefix, no counter to worry about. It's an output node, so it reports the preview back to the UI the same way the core PreviewImage does.

Why you'd reach for it

Honestly? Mostly because you've already swapped your Save node for the stripped version and you want the matching preview when you're testing mid-graph - keep everything in the fsdymy family and you don't have to remember which output path a given run went to. There's also a marginal nicety: since it never touches your output directory, you can wire it up as a pure check-ahead preview without polluting your batch results with test frames. If you batch a bunch of prompts and want to eyeball results before committing them to disk, this is a clean inline monitor.

Install and gotchas

Same pack as everything else here. ComfyUI Manager → search "ComfyUI_fsdymy", or:

cd ComfyUI/custom_nodes
git clone https://github.com/fsdymy1024/ComfyUI_fsdymy

then restart. You'll find it under fsdymy/image. No models, no downloads, no heavy dependencies.

The only real trap is expectation-setting: it doesn't strip anything you'd actually ever share, because temp previews never make it to your output folder as files. If your actual need is clean files that you'll post or send, you want the SaveImageWithoutMetadata sibling, not this. And like the rest of this pack, it's a small unmaintained repo from mid-2024 - but a preview node this simple doesn't have much surface area to break.

It's a nice-to-have, not a must-have. If you're happy with core PreviewImage, you're missing nothing. But if you've gone full metadata-stripped on your saves, this keeps the visual feedback consistent.