diff --git a/src/iiiftilesource.js b/src/iiiftilesource.js
index b54d020b..cf7d1927 100644
--- a/src/iiiftilesource.js
+++ b/src/iiiftilesource.js
@@ -182,19 +182,34 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
     },
 
     /**
-     * Return the tileSize for the given level.
+     * Return the tileWidth for the given level.
      * @function
      * @param {Number} level
-    */
-    getTileSize: function( level ){
+     */
+    getTileWidth: function( level ) {
         var scaleFactor = Math.pow(2, this.maxLevel - level);
-        // cache it in case any external code is going to read it directly
+
         if (this.tileSizePerScaleFactor && this.tileSizePerScaleFactor[scaleFactor]) {
-            this.tileSize = this.tileSizePerScaleFactor[scaleFactor];
+            return this.tileSizePerScaleFactor[scaleFactor];
         }
-        return this.tileSize;
+        return this._tileWidth;
     },
 
+    /**
+     * Return the tileHeight for the given level.
+     * @function
+     * @param {Number} level
+     */
+    getTileHeight: function( level ) {
+        var scaleFactor = Math.pow(2, this.maxLevel - level);
+
+        if (this.tileSizePerScaleFactor && this.tileSizePerScaleFactor[scaleFactor]) {
+            return this.tileSizePerScaleFactor[scaleFactor];
+        }
+        return this._tileHeight;
+    },
+
+
     /**
      * Responsible for retreiving the url which will return an image for the
      * region specified by the given x, y, and level components.
@@ -216,7 +231,8 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
             levelHeight = Math.ceil( this.height * scale ),
 
             //## iiif region
-            tileSize,
+            tileWidth,
+            tileHeight,
             iiifTileSizeWidth,
             iiifTileSizeHeight,
             iiifRegion,
@@ -228,9 +244,10 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
             iiifQuality,
             uri;
 
-        tileSize = this.getTileSize(level);
-        iiifTileSizeWidth = Math.ceil( tileSize / scale );
-        iiifTileSizeHeight = iiifTileSizeWidth;
+        tileWidth = this.getTileSize(level);
+        tileHeight = this.getTileHeight(level);
+        iiifTileSizeWidth = Math.ceil( tileWidth / scale );
+        iiifTileSizeHeight = Math.ceil( tileHeight / scale );
 
         if ( this['@context'].indexOf('/1.0/context.json') > -1 ||
              this['@context'].indexOf('/1.1/context.json') > -1 ||
@@ -240,7 +257,7 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
             iiifQuality = "default.jpg";
         }
 
-        if ( levelWidth < tileSize && levelHeight < tileSize ){
+        if ( levelWidth < tileWidth && levelHeight < tileHeight ){
             iiifSize = levelWidth + ",";
             iiifRegion = 'full';
         } else {
diff --git a/src/tilesource.js b/src/tilesource.js
index 1d70738e..fa51915b 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -142,13 +142,6 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
      * @member {OpenSeadragon.Point} dimensions
      * @memberof OpenSeadragon.TileSource#
      */
-    /**
-     * The size of the image tiles used to compose the image.
-     * Please note that tileSize may be deprecated in a future release.
-     * Instead the getTileSize(level) function should be used.
-     * @member {Number} tileSize
-     * @memberof OpenSeadragon.TileSource#
-     */
     /**
      * The overlap in pixels each tile shares with its adjacent neighbors.
      * @member {Number} tileOverlap
@@ -179,7 +172,8 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
         //async mechanism set some safe defaults first
         this.aspectRatio = 1;
         this.dimensions  = new $.Point( 10, 10 );
-        this.tileSize    = 0;
+        this._tileWidth  = 0;
+        this._tileHeight = 0;
         this.tileOverlap = 0;
         this.minLevel    = 0;
         this.maxLevel    = 0;
@@ -197,9 +191,12 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
             (  options.width / options.height ) : 1;
         this.dimensions  = new $.Point( options.width, options.height );
         
-        this.tileSize = options.tileSize ? options.tileSize : 0;
-        this.tileWidth = options.tileWidth;
-        this.tileHeight = options.tileHeight;
+        if ( options.tileSize ){
+            this._tileWidth = this._tileHeight = options.tileSize;
+        } else {
+            this._tileWidth = options.tileWidth ? options.tileWidth : 0;
+            this._tileHeight = options.tileHeight ? options.tileHeight: 0;
+        }
         
         this.tileOverlap = options.tileOverlap ? options.tileOverlap : 0;
         this.minLevel    = options.minLevel ? options.minLevel : 0;
@@ -221,21 +218,12 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
 
 $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
 
-    /**
-     * Return the tileSize for a given level.
-     * Subclasses should override this if tileSizes can be different at different levels
-     *   such as in IIIFTileSource.  Code should use this function rather than reading
-     *   from .tileSize directly.  tileSize may be deprecated in a future release.
-     * @deprecated
-     * @function
-     * @param {Number} level
-     */
     getTileSize: function( level ) {
         $.console.error(
             "[TileSource.getTileSize] is deprecated." +
             "Use TileSource.getTileWidth() and TileSource.getTileHeight() instead"
         );
-        return this.tileSize;
+        return this._tileWidth;
     },
     
     /**
@@ -247,11 +235,10 @@ $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
      * @param {Number} level
      */
     getTileWidth: function( level ) {
-        // If tileWidth was not set, fallback by setting it to tileSize
-        if( this.tileWidth === undefined){
-            this.tileWidth = this.tileSize;
+        if (!this._tileWidth) {
+            return this.getTileSize(level);
         }
-        return this.tileWidth;
+        return this._tileWidth;
     },
 
     /**
@@ -263,11 +250,10 @@ $.TileSource.prototype = /** @lends OpenSeadragon.TileSource.prototype */{
      * @param {Number} level
      */
     getTileHeight: function( level ) {
-        // If tileHeight was not set, fallback by setting it to tileSize
-        if( this.tileHeight === undefined ){
-            this.tileHeight = this.tileSize;
+        if (!this._tileHeight) {
+            return this.getTileSize(level);
         }
-        return this.tileHeight;
+        return this._tileHeight;
     },
 
     /**