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Digital image resolution converter
DPI, PPI and the metric forms. 5 units, converted from one table of exact factors.
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1 dot/meter in every other digital image resolution unit
Computed by the same engine that runs the converter above, so these can never drift apart from it.
| From | Equals | Unit |
|---|---|---|
| 1 dot/meter | 0.001 | dot/millimeter (dot/mm) |
| 1 dot/meter | 0.0254 | dot/inch (dpi) |
| 1 dot/meter | 0.0254 | pixel/inch (ppi) |
| 1 dot/meter | 0.01 | pixel/centimeter (px/cm) |
What each unit actually is
Most converters give you a number and stop. Where a figure is exact by definition we say so, and where it is an average or shifts with conditions we say that too — that is usually the thing you needed to know.
| Unit | Symbol | What it actually is |
|---|---|---|
| dot/meter | dot/m | |
| dot/millimeter | dot/mm | |
| dot/inch | dpi | What a printer is rated in. |
| pixel/inch | ppi | Numerically identical to dpi — the words differ, the number does not. |
| pixel/centimeter | px/cm |
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