color_OneColor_replace

color_OneColor_replace finds pixels close to one color and swaps them for another. The default target_color is #09FF00 - a near-pure chroma green - which is a strong tell that the author's first use case in mind was green-screen-style background replacement, though nothing stops you using it for any flat-color swap (turn a red shirt blue, recolor a solid backdrop, and so on). It's under Apt_Preset/image/color_adjust.

For an actual green-screen background swap on a busy image you'd normally reach for a proper chroma-key or segmentation node - this pack has separate segmentation nodes for that job. But for quickly recoloring a flat or near-solid area in a generated image, this is a lot less setup than building a full mask pipeline.

How it works

A threshold-based replace: any pixel within clip_threshold of target_color gets swapped to replace_color. There's no edge feathering built in - this is a simple distance-based match, not a proper key with soft edges.

The inputs and outputs that matter

• target_color (hex, default #09FF00) - the color to find.
• replace_color (hex, default #FF0000) - what it gets swapped to.
• clip_threshold (0-255, default 10) - how close a pixel needs to be to target_color to get swapped. Tight by default, so it only catches near-exact matches out of the box.
• image in (optional in the schema, but you'll want one wired), IMAGE out.

How to install it

Through ComfyUI Manager: search "ComfyUI-Apt_Preset", install, restart. Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/cardenluo/ComfyUI-Apt_Preset.git

then run install.bat (Windows) or install requirements manually on Linux/Mac, and restart. No model downloads for this node.

Common issues & troubleshooting

Nothing gets replaced. Raise clip_threshold - 10 is tight, and real renders rarely have perfectly flat, uniform color, so a strict tolerance can miss most of the region you're after.

Too much gets replaced, bleeding into areas you wanted kept. Lower clip_threshold back down.

Edges around the swapped area look hard or fringed. Expected - this is a simple threshold-based replace, not a proper key with edge feathering. At low clip_threshold you'll see hard edges; at high thresholds, color fringing where near-matches get caught too.

Want to keep a color instead of replacing it? color_OneColor_keep, the companion node in this pack, desaturates everything except your chosen color instead of swapping it.

IMPORT FAILED on the pack. ComfyUI-Apt_Preset is large and updates often; users have reported import failures after some updates. Reinstall via Manager before assuming it's this node.