Why AI-generated wall art doesn't need 300 DPI — and the math behind it

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A developer building a text-to-wall-art platform discovered that blindly applying the standard 300 DPI print rule to large-format products like tapestries and posters was causing oversized files and memory crashes. The 300 DPI standard is designed for printed materials viewed at close range, such as books and magazines, not large wall art viewed from several feet away. Using a formula based on human visual acuity and viewing distance, the developer calculated that a 4×6-foot tapestry viewed from six feet away requires only around 48 PPI, meaning a single 4× upscale from a 1024px AI-generated image produces enough pixels for every product in the lineup. The key insight was that a large tapestry and a small canvas require nearly the same pixel count, because greater viewing distance offsets the larger physical size. Capping upscaling at 4096 pixels and moving the process to a background queue eliminated the memory overflows that had been intermittently crashing the pipeline.

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