+Inline patch:
+
+diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
+index b98e843..398e9bc 100644
+--- a/IkiWiki/Plugin/img.pm
++++ b/IkiWiki/Plugin/img.pm
+@@ -132,9 +132,9 @@ sub preprocess (@) {
+ $imglink = $file;
+ }
+ }
+-
+- $dwidth = $im->Get("width") unless defined $dwidth;
+- $dheight = $im->Get("height") unless defined $dheight;
++ # get true image width and height from resized image attributes
++ $dwidth = $im->Get("width");
++ $dheight = $im->Get("height");
+ }
+ }
+ else {