PPI vs DPI: why they are not the same number
PPI counts source-image pixels per print inch; printer DPI counts physical output dots. Compare the units, formula, example, and conversion boundary.
Read guidePrint-resolution boundaries
Print-resolution guides with the boundary visible
Three guides explain PPI versus DPI, exact pixel math, target-density decisions, and what arithmetic cannot certify.
Pixels, print size, and exact physical-unit conversion
Follow pixels = inches × PPI in all three directions and keep centimetres, millimetres, and whole-pixel rounding explicit.
Read guideHow to choose a target PPI without inventing a universal threshold
Use printer requirements, viewing conditions, source quality, and intended size instead of treating one preset as a guarantee.
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