type: double, default: 96.0, minimum: 0.0
For bitmap output, dpi guarantees that text rendering will be done more accurately, both in size and in placement.
For SVG output, dpi guarantees the dimensions in the output correspond to the correct number of points or inches.
Note: bitmap output, svg only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/dpi/