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copied!<p>I had a brief look into this.</p> <p>The <code>Image.Resolution</code> property can be used to set the PDF rendering resolution but that property is not exposed by the ImageMagick.NET wrapper.</p> <p>Adding the missing property to the Image class is simple enough.</p> <pre><code>Index: ImageMagickNET/Image.h =================================================================== --- ImageMagickNET/Image.h (revision 59374) +++ ImageMagickNET/Image.h (working copy) @@ -532,6 +532,13 @@ } + // Vertical and horizontal resolution in pixels of the image. + property Geometry^ Density + { + void set(Geometry^); + } + + //---------------------------------------------------------------- // IO //---------------------------------------------------------------- Index: ImageMagickNET/Image.cpp =================================================================== --- ImageMagickNET/Image.cpp (revision 59374) +++ ImageMagickNET/Image.cpp (working copy) @@ -1099,5 +1099,9 @@ return bitmap; } + void Image::Density::set(Geometry^ density_) + { + image->density(*(density_->geometry)); + } } </code></pre> <p>Unfortunately it seems that <a href="http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=15585" rel="nofollow noreferrer">a bug</a> prevents us from setting the rendering quality while iterating through the PDF pages as you're attempting to do.</p> <p>Another option would be to open each page separately:</p> <pre><code>Image image = new Image(); image.Density = new Geometry("1000"); // 1000 dpi image.Read(@"C:\u\test.pdf[2]"); // Open the 3rd page, index 0 is the first </code></pre> <p>If the page number is out of range you get a <em>raw</em> C++ exception. While <a href="https://stackoverflow.com/questions/150544/can-you-catch-a-native-exception-in-c-code">you can catch it in C#</a> the wrapper should probably include a <em>.NET</em> exception class for representing ImageMagick errors.</p>

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