Hello,
The error occurs when exporting to a Cairo PNG image. There is no query for the 
size of the output image. It does not have sufficient pixels to resolve the 
diagram details. Using the PNG(anti-aliased) gives a decent result because you 
can specify the the dimensions of the output image. Attached is an example 
showing the output result, original diagram in dia, the popup window for 
specifying the output filename and format.


** Attachment added: "example of dia exported PNG (Cairo) file showing 
insufficient resolution"
   
https://bugs.launchpad.net/ubuntu/+source/dia/+bug/503296/+attachment/4187290/+files/Screen%20Shot%202014-08-26%20at%2013.23.22.png

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https://bugs.launchpad.net/bugs/503296

Title:
  no image dimension pop-up window for png export

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