QR Codes on Metal Surfaces: Three Steps to Solving Readability Problems

The reflective surface of metal can cause QR code scanners to fail. Here are three simple steps for improving the readability of QR codes on metal surfaces by optimizing the material, adjusting the contrast, and controlling the angle of the light.It can be used in industrial equipment or tool management, and solves the problem of scanning codes easily.

Why can't I scan metal QR codes?

If your smartphone has a hard time recognizing QR codes on metal surfaces, it's not the device's fault. The problem is usually due to the characteristics of the material. Excessive reflectivity can "blind" the camera, while scratches or oil on the surface can blur the lines. There is also the possibility that the difference between the QR code and the background is not great enough, and the software simply "gives up" and fails to recognize the code.

Three steps to improve scanning success.

A matte finish spa for QR codes.

If you try to print directly on the shiny metal, the scanner may be confused. Try this: Use a fine-grit sandpaper to lightly rough up a small area (don't overdo it, just a few scratches will do), and then spray on a layer of matte clear coat.This not only reduces the glare, it also prevents rust and scratches. The test car has been in the workshop for a year and the color hasn't faded.

The contrast between the black and the white must be strong.

You can't just slap on any old black. If the metal is gray, it's suggested that the dark squares of the QR code be changed to navy blue or dark green, and the light squares filled in with flat white paint.The contrast has to be high so that cell phone cameras can capture the edges.In fact, laser engraving is more durable than ink printing, especially for labels on outdoor equipment.

Finding a new angle for the "C" position.

If you're having trouble scanning a QR code, try the 45-degree trick: Tilt your phone 45 degrees relative to the code, to avoid having a light shining directly on it.If you are in a workshop, you can use your body to block a strong light behind you, or you can make a little shade with your fingers above the QR code.

These are the pitfalls.

I've seen people who want to make a QR code more noticeable enlarge it to the size of a hand, which makes the edges fuzzy. In fact, the best size is 3-5 cm. Some people like to put a decorative frame around a QR code, which causes the software to misidentify the positioning squares.Remember, you must leave at least twice the width of the code blank.

If you've tried all three of these tips and still can't scan the code, it's time to get a new phone! The leading QR code apps all support HDR, and even a phone costing only NT $ 1000 can handle high-reflectivity environments.Of course, if it is a permanent label for important equipment, then the best bet is to use a dot matrix engraving machine, but that will cost a little more.