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centimeters at each common DPI (100, 150, 200, 300) and at the chosen DPI, plus the DPI used, the timestamp, and optionally the pixels or megapixels required for a specified target print size, along with viewing distance advice.","failureModes":["Missing both pixel dimensions and print dimensions — endpoint needs either widthPx/heightPx or printWidthIn/printHeightIn to compute anything","Non-positive or zero pixel/inch values causing invalid calculation results","Extremely low DPI values producing unrealistically large print sizes with quality warnings","Network timeout or payment failure returning no result"],"whenToPreferThis":"Use this endpoint when you need to convert between image pixel dimensions and physical print sizes, or determine the minimum resolution required for a given print format. 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