--- src/extension/internal/image-resolution.cpp	2012-12-27 08:26:07 +0000
+++ src/extension/internal/image-resolution.cpp	2012-12-27 08:43:49 +0000
@@ -21,6 +21,9 @@
 #ifdef HAVE_JPEG
 #define IR_TRY_JFIF 1
 #endif
+#ifdef WITH_IMAGE_MAGICK
+#include <Magick++.h>
+#endif
 
 namespace Inkscape {
 namespace Extension {
@@ -39,6 +42,9 @@
     if (!ok_) {
         readexif(fn);
     }
+    if (!ok_) {
+        readmagick(fn);
+    }
 }
 
 bool ImageResolution::ok() const {
@@ -334,6 +340,33 @@
 
 #endif
 
+#ifdef WITH_IMAGE_MAGICK
+void ImageResolution::readmagick(char const *fn) {
+    Magick::Image image;
+    try {
+        image.read(fn);
+    } catch (...) {}
+    Magick::Geometry geo = image.density();
+    std::string type = image.magick();
+    
+    if (type == "PNG") { // PNG only supports pixelspercentimeter 
+        x_ = (double)geo.width() * 2.54;
+        y_ = (double)geo.height() * 2.54;
+    } else {
+        x_ = (double)geo.width();
+        y_ = (double)geo.height();
+    }
+    ok_ = true;
+}
+
+#else
+
+// Dummy implementation
+void ImageResolution::readmagick(char const *) {
+}
+
+#endif /* WITH_IMAGE_MAGICK */
+
 }
 }
 }
--- src/extension/internal/image-resolution.h	2012-12-26 06:42:18 +0000
+++ src/extension/internal/image-resolution.h	2012-12-26 14:39:58 +0000
@@ -18,19 +18,20 @@
 
 class ImageResolution {
 public:
-  ImageResolution(char const *fn);
-  bool ok() const;
-  double x() const;
-  double y() const;
+    ImageResolution(char const *fn);
+    bool ok() const;
+    double x() const;
+    double y() const;
 private:
-  bool ok_;
-  double x_;
-  double y_;
+    bool ok_;
+    double x_;
+    double y_;
 private:
-  void readpng(char const *fn);
-  void readexif(char const *fn);
-  void readexiv(char const *fn);
-  void readjfif(char const *fn);
+    void readpng(char const *fn);
+    void readexif(char const *fn);
+    void readexiv(char const *fn);
+    void readjfif(char const *fn);
+    void readmagick(char const *fn);
 };
 
 }