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We propose a novel user authentication system using RGB color- coded images. This system is divided into two parts: a sender system, and a receiver system. When the user inputs a digital password, such as text or numbers, the sender system converts this password to color-coded images, using a previously prepared coding algorithm. The receiver system detects these color-coded images by using a camera, extracts the color values, and decodes them into the original digital password. We present an experimental result of data transfer accuracy, to show that this system can work in real situations.