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Exported PDF slightly wrong size


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I have a 120 x 120mm document in AfDesigner. When it's exported as a PDF the size is 120.3 x 120.3. The release version also has the same problem. Publisher doesn't seem to have this problem.

Windows 10 Pro, I5 3.3G PC 16G RAM

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It seems to me, that those issues about wrong sizes of exported documents mainly affect files set up in the metric system.

I wonder, if Serif perhaps developed the Applications based on imperial units (instead of properly using the metric system) 
which needs conversions causing rounding errors/roundoff errors.

?

Fritz

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25 minutes ago, Fritz_H said:

It seems to me, that those issues about wrong sizes of exported documents mainly affect files set up in the metric system.

I wonder, if Serif perhaps developed the Applications based on imperial units (instead of properly using the metric system) 
which needs conversions causing rounding errors/roundoff errors.

Internally a pdf uses PostScript points as it coordinate/measurement system, so both imperial & metric measurement systems have to be converted.

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A bit more detail here. Publisher does in fact seem to behave the same as Designer. What seems to matter is the resolution set in Document Setup. Keeping with a 120mm square document a resolution of 72dpi gives a 120.3 page size, 75-70 gves 120.2 page size and 80 (and presumably higher gives the correct value of 120mm. It looks like a faulty algorithm somewhere along the line. Using APub beta I tried a few other dpi values and this is what I got:

dpi     mm
5        122
10      122
20      120.6
30      120.2
40      120
50      120.4
60      120.7

Windows 10 Pro, I5 3.3G PC 16G RAM

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