1. A computer-implemented method comprising: associating, by a computing system, one or more blocks of a scannable code with one or more corresponding parts of an image; generating, by the computing system, a personalized scannable code from the scannable code based on one or more adjusted opacities for the one or more blocks of the scannable code; determining, by the computing system, the personalized scannable code to not satisfy a readability threshold; and adjusting, by the computing system, one or more opacities of one or more blocks of the personalized scannable code.