OpenPose Part Mask

Sometimes you don't want the full crop-and-stitch detailer loop - you just want a mask around a body part, to feed into an inpaint node or a crop-stitch utility you already own. That's this node's entire job, and it's the smaller, more composable sibling of OpenPose Part Crop: same pose-keypoint detection, but the output is a plain rectangular mask plus its bounding box.

What it does

Give it an image and a POSE_KEYPOINT (from a live pose detector or this pack's OpenPoseImageToKeypoints), pick a region, and it builds a rectangle around that region's keypoints. The box is clamped to the image, padded, optionally forced square, and emitted as a mask. You can also override the named region with raw BODY_18 indices via keypoint_indices (e.g. 5-7 for the left arm), same as the Crop node.

Inputs worth knowing

• region - head, face, hands, feet, arms, legs. Remember left/right are anatomical: "right_hand" usually appears on the left of your image; mirror_left_right flips that.
• padding (default 1.3) - expands the box around the region; 1.0 is tight. Inpainting wants a little breathing room so the fill has context.
• make_square - force the box square (useful for detailers and for models that want square crops). Off by default here; the Crop node defaults it on, which tells you something about the intended use of each.
• min_size (default 64), mask_blur (default 0) - floor on box size, and optional edge feathering.
• person_index / person_order - pick which person; use "left_right" order for a stable two-character setup.
• confidence (default 0.05) - how confident a keypoint must be to count.

Outputs

mask plus the raw geometry - x, y, width, height - so you can wire the box into anything that wants a bbox rather than a mask. That's four extra outputs you don't get from most mask nodes, and they make this drop-in for crops, ControlNet region wiring, or even just logging the region.

How to use it

The canonical flow, straight from the node's own description: feed the mask into InpaintCropAndStitch (the crop-edit-stitch utility that became the standard way to fix a region without touching the rest of the image) or into any inpaint/detailer node. Compared to OpenPose Part Crop, this hands you the mask and lets you supply your own crop-and-stitch machinery, so you're not locked into the pack's stitch format. If one detection is off, the box falls back to whole-image rather than failing the graph, and the console prints what it found.

Install

Part of Mickmumpitz-Nodes (MIT, deps: numpy, Pillow, opencv-python - no models). ComfyUI Manager, search "Mickmumpitz", or:

cd ComfyUI/custom_nodes && git clone https://github.com/mickmumpitz/ComfyUI-Mickmumpitz-Nodes.git

Restart, find it as "OpenPose Part Mask" under Mickmumpitz/OpenPosePartCropper.