Select From Batch

If you've ever generated a batch of eight images and wanted to keep only number six, this is the node that makes it one click instead of a scavenger hunt. Select From Batch is a tiny utility from the ComfyUI Flux Continuum pack that turns a batch index into an integer, so you can grab one image out of a queue and route it onward - to an upscaler, a detailer, or back through img2img.

How it works

Honestly, it does very little, and that's the point. The node is a slider wired to a pass-through: you pick a number, it outputs that number as an INT. The actual "select from batch" work happens downstream - whatever node you feed the integer into (typically a batch-index-aware selector or an image picking node) does the heavy lifting. This node is the control surface, not the engine.

In the Flux Continuum workflow it lives among the slider suite - the same family as Denoise Slider and Step Slider - so you get a consistent-looking control rather than typing a bare integer into a widget. That matters more than it sounds: in a big modular workflow, having every tunable on the same visual language is what keeps the thing legible.

Inputs and outputs

• value - FLOAT, 0 to 24, default 0, step 1. Zero-indexed, so image 1 is value 0.

Output is one INT. It's a rounded pass-through - set the slider to 6 and you get 6 out. Wire that into whatever downstream node expects a batch position.

Installing it

It's part of the robertvoy/ComfyUI-Flux-Continuum repo, so you get it by installing the pack:

cd ComfyUI/custom_nodes
git clone https://github.com/robertvoy/ComfyUI-Flux-Continuum

or via ComfyUI Manager (search "Flux Continuum"), then restart. No extra dependencies - the pack declares none of its own - though the full workflow wants the usual stack (Impact Pack, rgthree, KJNodes).

The catch

The range tops out at 24, which covers the pack's batch slider (1–10) several times over. If you're batching more than 25 images you're outside its range and should reach for a proper batch-selector node instead. Also note the input is declared as a FLOAT slider while the output is INT - the node rounds internally, so you can't actually select "image 3.5." It's a convenience knob, not a full-featured batch manager, and for what it is, it's perfectly adequate.