Hacker News Reader

My bank uses some colored pixelcode not unlike this one. I scan a code on my screen using a little device that I insert the bank card into.

It's cool, it works well and it's fancy, but every time I do banking I have to turn off my computer's "night light" mode.

I assume lots of people use color filters for various good reasons. Are these codes resisent to that? Else I'd truly prefer oldschool monochrome QR codes, to be honest.

View on HN

This is pretty easily fixed by doing white balance correction. One piece of the barcode is always kept white, and it is used for color calibration. assuming the color transformation is constant across the entire code (which is the case in your example) you can undo some pretty large color shifts.

I've seen worse: some machine had a built-in camera recognizing QR code, but it couldn't really control exposure so I had to manually set my phone's brightness low to get the code detected. Quick Response? Screw that.

Reply on news.ycombinator.com