AC_Super_PreviewImage

AC_Super_PreviewImage is the end of a branch: a terminal node that shows you what a pipeline produced without committing it to disk. It's this pack's version of ComfyUI's built-in Preview Image - the node you hang off the VAE decode when you're iterating and don't want your output folder filling up with test renders.

How it works

The clever part is that it inherits the save logic from AC_Super_SaveImage but redirects the destination. Where SaveImage writes to your ComfyUI/output folder, PreviewImage writes to the temporary directory with a random per-instance filename prefix, then hands the results to the UI. Your image shows up in the interface exactly like a saved one - but it's temp data, cleaned up on restart. Nothing accumulates in output, which is exactly the behavior you want mid-experiment.

The inputs

All three are optional, so you can wire whichever form your data is in:

• samples (LATENT) plus vae (VAE) - if you feed both, the node decodes the latent through the VAE and previews the result. This is the "preview before you save" workflow.
• images (IMAGE) - if your pipeline already decoded to pixels, feed that instead. No VAE needed.

There are no required inputs at all, which means you can drop one of these into a workflow as a passive viewer on any wire that carries latents or images.

Installing it

Part of ComfyUI_AC_FUNV8Beta1 by Cc啊程 (Bilibili ComfyUI teacher; the README is Chinese). ComfyUI Manager (search "AC_FUN") or:

cd ComfyUI/custom_nodes
git clone https://github.com/A719689614/ComfyUI_AC_FUNV8Beta1

Restart ComfyUI. No downloads.

Where people get burned

The main confusion is expecting it to save. It's a preview, not an archive - temp files vanish, so once you've locked a result, switch to AC_Super_SaveImage (or the core Save Image) to keep it. Also note it's an output node, so it always runs and it terminates that branch of the graph - you can't wire anything after it. If you want to preview and keep a copy in one pass, use SaveImage; if you want to preview on a branch while saving elsewhere, this is the right tool.