𝙆 ab Images

The plainest save node in the whole pack: wire in one image, optionally a second, and it writes both straight to your ComfyUI output directory. No filename templating, no color profile picker, no metadata options - that's what Custom Save Image, elsewhere in this pack, is for. ab Images is the quick-and-dirty version, and the a/b naming is a pattern that shows up across several other KayTool nodes too (Image Composer's image_a/image_b, Image Cropper's target: a/b), so if you've used those, this node's naming will already feel familiar.

The obvious use case is a quick before/after or comparison dump - run the same prompt through two settings, wire both results into a and b, and get them both saved without building out a whole comparison grid workflow.

How it works

There's genuinely not much to it. a is required, b is optional - you can use this node with just one image if you want, though at that point the stock Save Image node does the same job. Both get written to disk using ComfyUI's default output handling; there's no exposed control here for naming or format, which is the trade-off for how simple the node is.

That trade-off is really the whole pitch. Every extra option a save node exposes - filename tokens, color profiles, metadata fields - is one more thing to configure before you can trust the output, and most of the time when you're mid-iteration you don't want any of that, you just want to see the result on disk next to the last one. This node is what you drop in when you're still deciding whether an approach works at all, before it's worth setting up Custom Save Image's templating for a real batch run.

The inputs that matter

• a (IMAGE) - required.
• b (optional, IMAGE) - second image, if you have one.

No outputs - like any save node, it's a terminal point in your graph.

Installing it

Comes with the full KayTool install: ComfyUI Manager → search KayTool → install → restart, or cd ComfyUI/custom_nodes && git clone https://github.com/kk8bit/KayTool and restart. Nothing extra to configure.

Common issues

Because this node exposes no filename control, if you're running comparison batches and need to know afterward which file corresponds to which run, you'll want to check ComfyUI's own output naming convention (typically an incrementing counter) rather than expecting this node to label things a and b for you in the filename - it doesn't. If you need real control over naming, color profile, or metadata, that's a sign you've outgrown this node and want Custom Save Image instead. Otherwise this is about as low-risk as a node gets: if an image doesn't show up in your output folder, check the usual suspects first - output directory permissions, disk space, or whether the run actually completed rather than erroring upstream of this node.