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The blurriness may result from resizing. If there are aspects of the larger diagram which are not evenly divisible by your reduction factor, then it will blur. For example if you are drawing at twice normal scale and have let's say windows at 13 pixels centre-to-centre, then they will be 6.5 pixels c/c once reduced. The program can't display a half pixel so it makes a "composite" pixel as the average of that one and the other half pixel.
Member of the SSPIA Senior Committee. Have a question? Go pester Tony.