🐯 YFG Monochrome Image Clip

Sometimes you don't want a soft grayscale - you want clipped grayscale: everything above a threshold forced one way, everything below forced another, or slammed to zero. That's what Mono Clip does, and because it offers six threshold modes it covers a surprising amount of ground: hard black-and-white masks, silhouette extractions, thresholded alpha channels, and stylized high-contrast art.

It's the "Monochrome Image Clip" node from the YFG Comical pack (gonzalu/ComfyUI_YFG_Comical), based on code originally by XSS. One IMAGE in, one IMAGE out - no mask output, so if you need an actual MASK tensor you'd feed the result to an image-to-mask converter.

The modes

The mode dropdown is where the power lives. All six compare each pixel against threshold:

• binary - above threshold → white, else black. Your classic hard threshold.
• inverse binary - the negative of that.
• to zero - above threshold keeps its value, below → black.
• inverse to zero - below threshold keeps its value, above → black.
• truncate - above threshold clamps to the threshold value, below keeps its value.
• inverse truncate - below clamps to the threshold, above keeps its value.

The README's "each reversible" point is the useful one: binary and inverse binary are opposites, and the truncate modes give you soft, low-key versions. For a mask you'd want binary; for a stylized treatment, to zero or truncate keeps some tonality.

channel picks which channel feeds the threshold: red, green, blue, or greyscale (luminance). If you're thresholding a subject that pops on the red channel but not on luminance, that choice can be the difference between a clean silhouette and noise. Default threshold is 0, so raise it - on a normal image a threshold of 0 with binary mode gives you an almost-all-white output.

Output

A single IMAGE output, same dimensions as the input. Wire it into a SaveImage for stylized output, or into an image-to-mask node when you need a hard mask downstream.

Installing

Part of the pack: ComfyUI Manager → search "YFG Comical", or

cd ComfyUI/custom_nodes
git clone https://github.com/gonzalu/ComfyUI_YFG_Comical

Restart ComfyUI. Same pack-wide caveat as the rest - the pack imports cv2/matplotlib in some files without listing them in pyproject.toml; if the pack won't load, pip install opencv-python matplotlib and restart.

Practical take

This node is the right tool when a plain ImageThreshold feels too blunt and drawing a mask feels too slow. The multi-channel input is the sleeper feature - thresholding a specific color channel often beats luminance for separating a subject from a background. For genuinely soft masks, though, the pack's Image To Contrast Mask (with its blur) is the better call; Mono Clip is a scalpel, not a paintbrush.