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When looking at a pdf file I noticed that a line was much thicker than it was supposed to be. Now it seems that Adobe Acrobat (both Pro and Reader) displays this line much thicker than SumatraPDF. I made sure the scaling of both programs was the same. Below are two crops at the same magnification that clearly show the problem. As I was under the impression that pdf should be platform independent, this seems like undesirable behaviour. Is this indeed the case, or am I misunderstanding something here?

For completeness, I'm using Acrobat Reader 11.0.18 and SumatraPDF 2.5.2 and the file was generated using pdflatex 2.9.5496 64-bit and pgf version 3.0.0. Acrobat and SumatraPDF images, respectively:

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After some more investigation I found a probable cause. It seems like Acrobat uses a minimum line width. Especially for these thin lines that does make a difference. This would also explain why the both readers look alike when zoomed in. My guess is Adobe opted for this behavior to improve readability.

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