ComfyUI nodes that turn a Flux Klein workflow into something simple. Plug in your model, drop an image, write a prompt, and go — no manual wiring of internal pieces. Whether you want to generate from scratch, transform an existing photo, paint over a specific area, or zoom in for a high-detail touch-up, a couple of nodes handle it all. Optional extras let you build the prompt from curated presets, and control how much each reference image shows up — or which part of the canvas it lands on.

https://github.com/user-attachments/assets/f84cc919-325d-465b-8d3d-e178de5f7872

Full introduction tutorial

What you can do with it

Generate images from a prompt — just connect the model and write what you want.
Transform an existing image — drop your image into the reference slot and add a prompt describing the change.
Inpaint a specific area — paint a mask and the masked zone is the only part that gets regenerated. Everything else stays untouched.
Detail a small area at high quality — turn on detailing to zoom into the masked zone (a face, a hand, an eye) and regenerate it with way more detail than you'd get from a full-image pass.
Combine multiple reference images — extra slots appear as you connect them, so you can give the model several visual hints to work with.
Dial each reference separately — turn one reference up or down on its own, or (experimental) send it to a specific area of the canvas.

The node figures out which mode you're using based on what you connect — no setting to flip.

The nodes

| Node | What it does | |---|---| | 😺NKD Klein Presampling | The starting point. Model, prompts and reference image go in here. | | 😺NKD Klein Postsampling | The end point. Delivers the final image and puts everything back after inpainting or detailing. | | 😺NKD Klein Reference Control | The all-in-one reference dial, and the one to reach for today: strength, an optional per-step curve, and a zone if you give it a mask. optional, experimental | | 😺NKD Klein Reference Weight | The original strength-only node. Still works; Reference Control does everything it does. optional | | 😺NKD Klein Reference Region | The regional half on its own, for when a Reference Weight node is already in the chain. optional, experimental | | 😺NKD Klein Reference Fit | Scales a reference so it sits inside the masked zone instead of stretching across the whole canvas. optional, experimental | | 😺NKD Klein Prompt Builder | Builds a prompt from your own text plus curated preset dropdowns, with a live preview. optional |

The chain looks like this:

flowchart LR
    PRE["**NKD Klein**<br/>**Presampling**"]:::nkd --> RC["**NKD Klein**<br/>**Reference Control** ×N"]:::nkd
    RC --> SAMP(["your sampler chain"]):::external
    SAMP --> POST["**NKD Klein**<br/>**Postsampling**"]:::nkd

    classDef nkd fill:#3b3b6b,stroke:#8ab4ff,stroke-width:2px,color:#fff
    classDef external fill:#2d2d2d,stroke:#888,color:#eee

Going further

| | | |---|---| | The nodes in detail | What each of the seven does, at length. | | Inputs and modes | Every input that changes the result, and the mode the node puts itself in when you connect one. | | Recipes and workflows | Settings that work, an example graph, and the order things go in. | | Changelog | What changed in each version. |

Requirements

ComfyUI with Flux Klein model support
PyTorch ≥ 2.0

Installation

Clone into your ComfyUI/custom_nodes folder:

git clone https://github.com/Nekodificador/ComfyUI-NKD-Klein-Tools

Or install via the ComfyUI Manager by searching for NKD Klein Tools.

Made by Nekodificador