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How do I obtain bitmap resolution values from a PDF

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How do I obtain bitmap resolution values from a PDF

Subject: How do I obtain bitmap resolution values from a PDF
From: Stephen Herron <email@hidden>
Date: Fri, 16 Jan 2009 11:17:47 -0800

Please help!

I would like to obtain the dpi value of a bitmap image in the PDF format sourced from a URL.

When I use:

myDPIValue = [_imageProperties objectForKey: (id)kCGImagePropertyDPIWidth];

the value is always 0

If I inspect the pdf I find the following:

         <tiff:XResolution>3000000/10000</tiff:XResolution>
         <tiff:YResolution>3000000/10000</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>

Which indicates that the real dpi is 300.

How do I read and write this tiff information within a PDF?

Stephen Herron
email@hidden

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