Get caught up:
Part 1: Stable Diffusion SDXL 1.0 with ComfyUI
Part 2: SDXL with Offset Example LoRA in ComfyUI for Windows
Part 3: CLIPSeg with SDXL in ComfyUI
Part 4: Two Text Prompts (Text Encoders) in SDXL 1.0
Part 5: Scale and Composite Latents with SDXL
Part 6: SDXL 1.0 with SDXL-ControlNet: Canny
Part 7: Fooocus KSampler Custom Node for ComfyUI SDXL
Part 8: This post!
About OpenPose and ControlNet
Quoting from the OpenPose Git, “OpenPose has represented the first real-time multi-person system to jointly detect human body, hand, facial, and foot keypoints (in total 135 keypoints) on single images.” In my very layman view, this means that given a reference image of the full body of a person, OpenPose can generate what I’d call a “skeleton wireframe” (keypoints) to describe the position of the persons limbs in space.
And as noted in my previous post, SDXL 1.0 with SDXL-ControlNet: Canny, ControlNet “is a neural network structure to control diffusion models by adding extra conditions.” With ControlNet, we can train an AI model to “understand” OpenPose data (i.e. the position of a person’s limbs in a reference image) and then apply these conditions to Stable Diffusion XL when generating our own images, according to a pose we define.
And we have Thibaud Zamora to thank for providing us such a trained model!
- Head over to HuggingFace and download
OpenPoseXL2.safetensorsfrom the controlnet-openpose-sdxl-1.0 repository, under Files and versions
- Place the file in the ComfyUI folder
First, we need a posed “skeleton wireframe” - a great and beautiful source is OpenPoses.com. Here you can clearly see what I mean by a “skeleton wireframe!” What a wonderful, generous resource. Go ahead and download any.
You know the drill:
- Start with a ControlNetLoader node and load the downloaded model.
- Use a LoadImage node to load the posed “skeleton” downloaded.
- Wire these up to up to a ControlNetApply node.
- The rest of the flow is the typical SDXL Base workflow...
- To create custom poses, downloaded the Custom Node ComfyUI-OpenPose-Editor by space-nuko.
- Unzip to the
- Re-start ComfyUI.
- Replace the LoadImage node with the node called Nui.OpenPoseEditor.
- Click the Open Editor button and in the popup editor, draw your pose(s).
- Close the popup editor, and run the flow!
Here are two poses I created myself. It is a challenge to get proportions right, and shame about the odd guns... but as an illustration, you can see how well ControlNet applies multiple poses to create a dynamic image.
I encountered an issue where the bottom part of the OpenPoseEditor dialog was not visible! Specifically you need to see a row of buttons and you need to be able to edit the Width and Height of the image:
The author of this custom node perhaps has a much larger monitor than I do! The bottom row of buttons was off the screen and impossible to reach!
- My solution is to edit the file
- At line 91 or thereabouts, edit the line that specifies the hard-coded height of the dialog box, adjusting the value to one that suits you.
- Save and re-start ComfyUI.
const height = 800; // originally, const height = 1000;
A final note: You may wish to try another Custom Node set, Fannovel16/comfyui_controlnet_aux v1.1 or the archived v1, which has a node called OpenposePreprocessor. I think this node uses OpenPose to “extract” “skeleton wireframe” from a reference image but I have not tried it...