BD Save Batch

An IMAGE batch in ComfyUI is one tensor with a bunch of frames in it, and the built-in SaveImage will happily write all of them as _00001, _00002, _00003… which tells you nothing. BD Save Batch is the BrainDead fix: it saves each frame as its own file with a meaningful label, and - the part that makes it genuinely clever - it can filter which frames get saved and which get passed downstream, independently. You don't just batch-save; you batch-save and route.

What it is

A save node that takes an images batch plus a labels list (one per line, aligned with frames) and writes one file per frame, using each label as the suffix. Its README-blessed pairing is with BD GLSL Batch: feed it fc1_batch + iteration_names and four GLSL variants (_light, _medium, _dark, _zombie) land as four distinct files from one node and one wire.

How it works

Frames and labels zip together: label light → suffix _light (with label_prefix default _ controlling the separator). If there are more frames than labels, the leftovers save with an empty suffix or a numeric fallback; extra labels are ignored. Then the two filters:

• save_only - comma-separated filter of which frames actually touch disk: indices (0,3) or labels (light,zombie) or mixed (0,zombie). Empty = save everything.
• pass_only - comma-separated filter of which frames flow out the passed_images output, same syntax. Independent from save_only, so you can save light,zombie to disk but only pass zombie downstream for post-processing.

That decoupling is the reason to use this node over a generic batch save: one batch can serve both as the archive and as the pipeline.

Inputs that matter

• images - the batch. That's it for required.
• labels - one per frame, in order.
• save_only / pass_only - the filters above.
• context_id - matches a BD Save Context (auto-picks if exactly one is registered).
• format - PNG default, others available.
• skip_if_exists - don't overwrite.
• alpha_mask / invert_alpha / save_alpha_separately / alpha_slots / embed_alpha - the alpha family. Bake a mask into the saved alpha (white = opaque), write sidecar _alpha.png files, and target only specific slots. If your source is already RGBA, the embedded alpha survives automatically - no mask wiring needed.

Outputs: saved_count, saved_paths (newline-joined absolute paths in batch order - great for feeding an exporter), passed_images + passed_labels (the routed subset), preview_images (the unfiltered passthrough - wire it to a PreviewImage to sanity-check before production), status, and preview_alpha (the alpha channel rendered as RGBA for inspection).

The gotcha

preview_images is deliberately unfiltered - it ignores save_only/pass_only - so if you wire it to a PreviewImage node and forget it in production, you're previewing every frame on every run. The tooltip says it plainly: disconnect or bypass the preview node when you go live. Cheap mistake, mildly annoying cleanup.

Installing it

ComfyUI Manager: search "BrainDead" → install. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/BizaNator/ComfyUI-BrainDead
cd ComfyUI-BrainDead
pip install -r requirements.txt

Restart, find it under 🧠BrainDead/Cache. No extra dependencies. If your batch comes out of a node that doesn't label its frames, the labels widget is just text - type them in the same order as the batch, and remember pass_only is your friend when only one tone should flow to the next stage of the graph.