AD Color Image

Makes a flat, solid-color image at whatever size you ask for. Sounds trivial, and it is - but you reach for it more often than you'd expect. Backgrounds to composite over, base plates for layering, blank canvases, quick test inputs, a colored fill for a mask region. Every compositing workflow needs a solid color somewhere, and this is the cleanest way to conjure one.

Where it fits

A lot of ComfyUI work is compositing: overlay a subject on a background, build up layers, generate a base to draw or inpaint on. You constantly need a plain colored surface as the bottom layer or a placeholder. Rather than loading a PNG of a white square from disk, you generate exactly the size and color you need on the spot. It also makes a handy test signal - a known solid image is useful for sanity-checking that the rest of a pipeline is wired right.

How it works

You set width and height, pick a color, and it outputs an image filled with that color. The color dropdown has the common names plus a custom option; choose custom and it uses the hex_color field instead. alpha controls opacity for cases where you want a semi-transparent plate. There's also an optional reference_image - feed one in and the node can match its dimensions, so you don't have to type the width and height by hand when you're making a plate to sit behind an existing image.

The inputs that matter

• width / height - the output size in pixels. Or skip these and use reference_image to match an existing image.
• color - a named color, or custom to use your own hex.
• hex_color - your exact color when color is set to custom. Ignored otherwise, which is the one gotcha here.
• alpha - opacity, 0 to 1. Leave at 1 for a fully solid fill.

The single output is image - wire it into a composite, a background input, or straight to a Preview to eyeball the color.

Common issues

The thing that catches people: hex_color only does anything when color is set to custom. Type a hex value while color is still on white and you'll get white and wonder why. Pick custom first. Otherwise this is about as bulletproof as a node gets - the main "problem" is remembering it exists when you're hunting for a background source. If you're matching an existing image, use reference_image rather than eyeballing the dimensions; it's exact and saves a step.

Installing ComfyUI-Addoor

ComfyUI-Addoor (葵花宝典) is a utility and image pack from developer Eagle-CN. ComfyUI Manager: Install Custom Nodes → search "ComfyUI-Addoor" → install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Eagle-CN/ComfyUI-Addoor.git
cd ComfyUI-Addoor
pip install -r requirements.txt

Restart and find it under 🌻 Addoor / image.