Meux Mask Blur+

Mask blurring sounds trivial until you need it - soft edges on an inpaint mask, a feathered blend region, a smooth falloff instead of a hard line. ComfyUI's own masking nodes don't make it one click. This one does: MeuxMaskBlurPlus is a three-input gaussian blur for masks, the sort of node you drop into a workflow and never think about again.

It also carries a compatibility alias. This class is registered as both MeuxMaskBlurPlus and MaskBlur+, matching the name ComfyUI Essentials uses for the same job - so a shared workflow that references MaskBlur+ loads with this pack quietly satisfying it. Same story as Seed and Mask Fill Holes elsewhere in the pack: they're not just utilities, they're compatibility shims for workflows that expect the classic node names.

How it works

It runs a gaussian blur on the mask tensor via torchvision. Two details are worth knowing: the amount gets bumped up to the next odd number internally (blur kernels need odd sizes), and device lets you force CPU or GPU - auto picks whatever ComfyUI thinks is right.

Inputs:

• mask - the MASK you want to feather.
• amount - blur radius, 0 to 256. 0 passes the mask through untouched.
• device - auto, cpu, or gpu.

Output: a single MASK, same shape as the input, blurred.

Installing it

Same pack as the rest:

cd ComfyUI/custom_nodes
git clone https://github.com/fchangjun/Comfyui_MultiSaveImage
cd Comfyui_MultiSaveImage
pip install -r requirements.txt

Or search "Baidu Meux ComfyTools" in ComfyUI Manager, then restart.

Where people get burned

• Nothing appears to happen. amount of 0 is a passthrough - if your blur is invisible, you're at 0, not broken.
• Heavy blur on a big mask. Large amounts on high-res masks are the one place this gets slow; device = gpu usually fixes it.
• Expecting a community behind it. Honest note: this is an internal-tools pack from Baidu's Meux asset platform, and there's basically no Reddit chatter about it. You're using it because a workflow you downloaded references MaskBlur+, or because you want the utility - not because anyone's raving about it.

If you just need a feathered mask in ten seconds, this is the node. It won't blow your mind, and it doesn't have to.