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How to calculate dpi.

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Hi Team,

According to our requirement we are converting Pdf file into Images and displaying on the browser, 
we are displaying the pdf annotations as links on the browser using javascript. In this scenario we took 72 dpi by default its displaying the links on he browser acurately with pdf  annotations co-ordinates. when the pdf document is landscape or A3. It is not displaying the links accurately with pdf annotation co ordinates. 

Please help us how to calcuate dpi with pdf document size.

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