Where Is QRdo?

🫧 Open on Bubbles This was fun: A "Where Is Waldo" game for QR codes. Can you find it? Your phone can! The basic idea QR scanners don't see color. The first thing a decoder does is convert the image to grayscale — collapsing each pixel to a single brightness value via roughly 0.299·R + 0.587·G + 0.114·B — then binarize and hunt for the finder patterns (the three corner squares) and module grid. Everything downstream operates on luminance alone. That gap is the whole trick: luminance carries the code; hue an