diff --git a/src/tile.js b/src/tile.js
index 30082315..e2f34941 100644
--- a/src/tile.js
+++ b/src/tile.js
@@ -268,18 +268,18 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
             //clearing only the inside of the rectangle occupied
             //by the png prevents edge flikering
             context.clearRect(
-                position.x+1,
-                position.y+1,
-                size.x-2,
-                size.y-2
+                (position.x * $.pixelDensityRatio)+1,
+                (position.y * $.pixelDensityRatio)+1,
+                (size.x * $.pixelDensityRatio)-2,
+                (size.y * $.pixelDensityRatio)-2
             );
 
         }
 
         if(!rendered){
             canvas = document.createElement( 'canvas' );
-            canvas.width = this.image.width;
-            canvas.height = this.image.height;
+            canvas.width = this.image.width * $.pixelDensityRatio;
+            canvas.height = this.image.height * $.pixelDensityRatio;
             rendered = canvas.getContext('2d');
             rendered.drawImage( this.image, 0, 0 );
             this.cacheImageRecord.setRenderedContext(rendered);
@@ -297,10 +297,10 @@ $.Tile.prototype = /** @lends OpenSeadragon.Tile.prototype */{
             0,
             rendered.canvas.width,
             rendered.canvas.height,
-            position.x,
-            position.y,
-            size.x,
-            size.y
+            position.x * $.pixelDensityRatio,
+            position.y * $.pixelDensityRatio,
+            size.x * $.pixelDensityRatio,
+            size.y * $.pixelDensityRatio
         );
     },
 
diff --git a/src/tiledimage.js b/src/tiledimage.js
index 34c8cd3b..2f3378d2 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -262,7 +262,7 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
 
     // private
     _viewportToImageDelta: function( viewerX, viewerY, current ) {
-        var scale = (current ? this._scaleSpring.current.value : this._scaleSpring.target.value) / $.pixelDensityRatio;
+        var scale = (current ? this._scaleSpring.current.value : this._scaleSpring.target.value);
         return new $.Point(viewerX * (this.source.dimensions.x / scale),
             viewerY * ((this.source.dimensions.y * this.contentAspectX) / scale));
     },
@@ -294,7 +294,7 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
 
     // private
     _imageToViewportDelta: function( imageX, imageY, current ) {
-        var scale = (current ? this._scaleSpring.current.value : this._scaleSpring.target.value) / $.pixelDensityRatio;
+        var scale = (current ? this._scaleSpring.current.value : this._scaleSpring.target.value);
         return new $.Point((imageX / this.source.dimensions.x) * scale,
             (imageY / this.source.dimensions.y / this.contentAspectX) * scale);
     },
@@ -562,6 +562,7 @@ function updateViewport( tiledImage ) {
     var viewportBR = viewportBounds.getBottomRight();
 
     //Don't draw if completely outside of the viewport
+    $.console.log(viewportTL.x);
     if  ( !tiledImage.wrapHorizontal && (viewportBR.x < 0 || viewportTL.x > tiledImage._worldWidthCurrent ) ) {
         return;
     }
diff --git a/src/viewport.js b/src/viewport.js
index d1f52223..44654f7e 100644
--- a/src/viewport.js
+++ b/src/viewport.js
@@ -897,8 +897,6 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     deltaPixelsFromPoints: function( deltaPoints, current ) {
         return deltaPoints.times(
             this._containerInnerSize.x * this.getZoom( current )
-        ).times(
-            $.pixelDensityRatio
         );
     },
 
@@ -910,8 +908,6 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
     deltaPointsFromPixels: function( deltaPixels, current ) {
         return deltaPixels.divide(
             this._containerInnerSize.x * this.getZoom( current )
-        ).divide(
-            $.pixelDensityRatio
         );
     },
 
@@ -932,8 +928,6 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
             this._containerInnerSize.x / bounds.width
         ).plus(
             new $.Point(this._margins.left, this._margins.top)
-        ).times(
-            $.pixelDensityRatio
         );
     },
 
@@ -944,9 +938,7 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
      */
     pointFromPixel: function( pixel, current ) {
         var bounds = this.getBounds( current );
-        return pixel.divide(
-            $.pixelDensityRatio
-        ).minus(
+        return pixel.minus(
             new $.Point(this._margins.left, this._margins.top)
         ).divide(
             this._containerInnerSize.x / bounds.width