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Load Image (as Mask)-Node in ComfyUI

Load Image (as Mask) turns one channel of a picture (alpha, red, green or blue) into a MASK, so black-and-white mask files or painted layers can drive inpainting and compositing.
Node-Paket: ComfyUI core
Kategorie: Masken und Inpainting
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Was Load Image (as Mask) macht

Where Load Image gives you the picture, Load Image (as Mask) gives you a mask built from a chosen channel. Pick alpha for transparent PNGs, or red for a plain black-and-white mask file: white pixels become 1 (affected), black pixels 0 (protected). The output is a single-channel MASK at the size of the file.
It is the standard way to bring in a mask drawn in another program, a mask exported from a segmentation model, or a soft gradient mask for blending. Combine it with Grow Mask and Feather Mask to soften the edge before inpainting.

Eingänge

Name
Typ
Bedeutung
image
COMBO/upload
The mask file from ComfyUI/input.
channel
COMBO
alpha, red, green or blue. The channel that becomes the mask.

Ausgänge

Name
Typ
Bedeutung
MASK
MASK
A float mask with 1 where the channel is bright (or transparent for alpha).
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So verwendest du Load Image (as Mask)

  1. Export a black-and-white mask at the exact size of the picture you will inpaint.
  2. Add Load Image (as Mask), upload it and set channel to red.
  3. Optionally add Grow Mask (6-16 px) and Feather Mask for a soft edge.
  4. Connect MASK to Set Latent Noise Mask or VAE Encode (for Inpainting).
  5. Check the mask with a Convert Mask to Image -> Preview Image pair if the result looks wrong.

Einstellungen und Tipps

  • For alpha masks remember that transparent means masked (1), the opposite of a white-on-black file.
  • Masks are resized to the latent automatically by the inpainting nodes, but a mismatched aspect ratio is stretched.
  • Grey values make partial masks; a 50% grey pixel is half-strength denoise.
  • Invert Mask flips the selection without re-exporting the file.

Fehlerbehebung bei Load Image (as Mask)

The mask selects the wrong area (inverted)

Warum es passiert
White and black were swapped in the file, or alpha was chosen for an opaque image.

So behebst du es
Add Invert Mask, or switch channel to red for a black-and-white file.

Mask is all zeros

Warum es passiert
The chosen channel is uniform: for example alpha on a JPEG, which has no transparency.

So behebst du es
Use the red channel for black-and-white files, or re-export the mask with real transparency.

Hard, visible seam at the edge of the inpainted region

Warum es passiert
A binary mask with no soft edge and a high denoise value.

So behebst du es
Add Grow Mask then Feather Mask (8-24 px) before the inpainting node, and lower denoise slightly.

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Fragen zu Load Image (as Mask)

Can I paint the mask instead of loading a file?

Yes: use Load Image and its Mask Editor. Load Image (as Mask) is for masks that already exist as files.

Does the mask need the same size as the picture?

It should. Nodes resize it to fit, but different aspect ratios distort the selection.

Verwandte Nodes

Load Image
ComfyUI core
Load Image reads a picture from the ComfyUI input folder (or an upload) and outputs an IMAGE tensor plus a MASK taken from the alpha channel, the starting point for img2img, inpainting, ControlNet and IP-Adapter graphs.
Grow Mask, Feather Mask and Invert Mask
ComfyUI core
The core mask tools expand (Grow Mask), soften (Feather Mask) and flip (Invert Mask) a MASK so inpainted regions blend into the surrounding picture without visible seams.
Set Latent Noise Mask
ComfyUI core
Set Latent Noise Mask attaches a MASK to a LATENT so the sampler only changes the white area: inpainting and regional regeneration with any normal checkpoint.
VAE Encode and VAE Encode (for Inpainting)
ComfyUI core
VAE Encode converts a pixel IMAGE into a LATENT for img2img; VAE Encode (for Inpainting) does the same while blanking the masked area so an inpainting model can repaint it.
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Weitere ComfyUI-Nodes

CLIP Text Encode (Prompt)
ComfyUI core
CLIP Text Encode turns a text prompt into CONDITIONING using the model text encoder. One node holds the positive prompt, a second one the negative prompt.
ComfyUI Manager
ComfyUI-Manager
ComfyUI Manager is the extension that installs, updates and fixes custom node packs and models from inside the interface, resolves missing nodes in imported workflows and snapshots your setup.
KSampler
ComfyUI core
KSampler runs the denoising loop: it takes the model, prompts and a latent and produces the finished latent image, controlled by seed, steps, cfg, sampler, scheduler and denoise.
Load Checkpoint
ComfyUI core
Load Checkpoint (CheckpointLoaderSimple) opens a .safetensors or .ckpt model file and hands out the three parts every workflow needs: the diffusion MODEL, the CLIP text encoder and the VAE.
Save Image
ComfyUI core
Save Image writes the IMAGE tensor to ComfyUI/output as a PNG, with the whole workflow embedded in the file metadata so the picture can be dragged back into ComfyUI to restore the graph.
VAE Decode
ComfyUI core
VAE Decode converts the sampled LATENT into a pixel IMAGE with the VAE; VAE Decode (Tiled) does the same in tiles for very large images.