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Scale on screen will always be down to hardware and current DPI and for that reason both acrobat and SumatraPDF have different DPI overrides but they won't be identical as there seem to be other windows factors. However, as the data is PDF any area should be a known and agreed scale thus here at 100% zoom whatever that might be SumatraPDF has no problem saying the work area is 3 x 72 and 2 x 72 points When it comes to printing again scale should not be an issue. Printed at 100% opened at 100% remeasures as 3 x 72 & 2 x 72 points however as winprint is very poor raster I would not be using SumatraPDF for printing vectors you can see the file is 192 KB when the source was only 12 Kb |
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When viewing or printing in 100% zoom, it's not accurate.
Viewing: I know there have been discussions about how to get 100% zoom to work right; it should work right out of the box without having to edit advanced settings. On other PDF readers (Foxit, Acrobat), 100% is actually 100%. That is, you can hold a paper up to the screen and it's the same size.
Printing: When I generated a graphic that's 2" x 3" (using Kicad) and tried to view it at 100% zoom to see whether it's the right size (and failed), I went ahead and printed it. It printed out about 15/16th size. Not noticeable for most things, absolutely unusable for PCB prints. Note that I opened the same exact PDF in Foxit and Acrobat Reader, and they both printed the object the right size. Note I had printer settings set to 100% (no scaling or reducing to page size) for everything.
Attaching the PDF in question - the outline box should be 2" x 3".
Back v2.pdf
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