Both online and physical posters can have quality issues. Online posters might have blurry or pixelated pictures, colors that don't look right on all devices, and they can load slowly if they're too big. Physical posters can also have blurry pictures if the quality is low, and colors might not match what you see on a screen. Additionally, physical posters can get damaged easily if the paper is poor. In both cases, if the design is too cluttered, it can be hard to read and understand.