diff --git a/ChangeLog b/ChangeLog
index 3732968b7..72e035997 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-11-06  Eric Wasylishen  <ewasylishen@gmail.com>
+
+	* Source/NSBitmapImageRep+PNG.m:
+	HACK: PNG can not represent 72DPI exactly. If the pixels-per-meter value is
+	near 72DPI, assume it is exactly 72 DPI. Note that the same problem occurrs
+	at 144DPI, or 288DPI... so don't use PNG for resolution independent graphics.
+
 2011-11-06 Fred Kiefer <FredKiefer@gmx.de>
 
 	* Source/NSPopUpButtonCell.m (-insertItemWithTitle:atIndex:): Set
diff --git a/Source/NSBitmapImageRep+PNG.m b/Source/NSBitmapImageRep+PNG.m
index e031a34b4..0011da037 100644
--- a/Source/NSBitmapImageRep+PNG.m
+++ b/Source/NSBitmapImageRep+PNG.m
@@ -266,6 +266,19 @@ static void reader_func(png_structp png_struct, png_bytep data,
 	const CGFloat pointsPerMeter = 39.3700787 * 72.0;
 	NSSize sizeInPoints = NSMakeSize((width / (CGFloat)xppm) * pointsPerMeter,
 					 (height / (CGFloat)yppm) * pointsPerMeter);
+
+	// HACK: PNG can not represent 72DPI exactly. If the ppm value is near 72DPI,
+	// assume it is exactly 72 DPI. Note that the same problem occurrs at 144DPI...
+	// so don't use PNG for resolution independent graphics.
+	if (xppm  == 2834 || xppm == 2835)
+	  {
+	    sizeInPoints.width = width;
+	  }
+	if (yppm == 2834 || yppm == 2835)
+	  {
+	    sizeInPoints.height = height;
+	  }
+
 	[self setSize: sizeInPoints];
       }
   }