🚢 CreateSolidFrame

The one that makes a QR look like a finished card

CreateSolidFrame is the most straight-ahead of the pack's three frame nodes: it takes any image - most likely one of this pack's QR codes - and wraps it in a solid border, like putting a card in a matte. That's genuinely useful if your QR is headed to a poster, a business card, or a sticker, where a raw barcode floating on white looks unfinished and a border makes it read as a deliberate piece of design. It's the visual equivalent of the quiet zone: a little breathing room makes everything look intentional.

How it works

The node grows the canvas by frame_size pixels on every side and fills that new margin with bg_color. Then it draws a fg_color rectangle of thickness pixels around the outer edge of the canvas. So you get two decisions out of four inputs: frame_size controls how much colored margin surrounds the image, thickness controls how heavy the outer frame line is, and fg_color / bg_color pick the two colors. Colors are tuple-style strings - "(0, 0, 0)" style, not hex or CSS names.

A quick mechanism note that affects your results: the border is drawn with OpenCV rectangles on a numpy canvas, then your image is pasted in with PIL. Nothing fancy, nothing lossy - but because the frame is built at final canvas size, the thicker you go, the more the image itself shrinks relative to the whole card. For a QR, keep frame_size modest relative to width/height or the code gets small enough that scanners notice.

The single IMAGE output is just the framed image. There's no mask output on the frame nodes - they're decoration, not conditioning tools. Wire the output into a preview or Save Image and you're done.

The QR-specific advice

This is a framing node that happens to live in a QR pack, so treat the frame as extra quiet-zone budget: a white or light bg_color with a dark fg_color line reads best and keeps scanners happy. If you framed a colored or logo'd QR, do a quick sanity scan with the pack's QRCodeReader - the frame itself doesn't hurt scannability, but a busy background behind the code can.

Common issues

• Frame looks like it's missing → if fg_color equals bg_color, the outer line is invisible by design; give them contrast.
• Colors come out gray → the node fell back to its default gray because your color string wasn't in "(r, g, b)" format. Watch the parentheses and commas.

Installing it

Part of ComfyUI-Simple_QR_Codes: ComfyUI Manager → search "Simple QR Codes" → install → restart, or:

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

The frame nodes are why the pack requires opencv-python. No models to download. It shows up under QR Code Nodes → frames.