add new comparison option "scaleToSameSize"

README.md

@@ -45,6 +45,12 @@ var diff = resemble(file).compareTo(file2).ignoreColors().onComplete(function(da
 });
 ```
 
+Scale second image to dimensions of the first one:
+```javascript
+//diff.useOriginalSize();
+diff.scaleToSameSize();
+```
+
 You can also change the comparison method after the first analysis.
 
 ```javascript
@@ -53,6 +59,7 @@ You can also change the comparison method after the first analysis.
 diff.ignoreAntialiasing();
 ```
 
+
 And change the output display style.
 
 ```javascript

demoassets/main.js

@@ -115,6 +115,14 @@ $(function(){
 			resembleControl.ignoreAntialiasing();
 		}
 		else
+		if($this.is('#same-size')){
+			resembleControl.scaleToSameSize();
+		}
+		else
+		if($this.is('#original-size')){
+			resembleControl.useOriginalSize();
+		}
+		else
 		if($this.is('#pink')){
 			resemble.outputSettings({
 				errorColor: {

index.html

@@ -91,6 +91,13 @@
 									<button class="btn" id="antialising">Ignore antialiasing</button>
 								</div>
 
+								<br/>
+								<br/>
+								<div class="btn-group buttons" style="display:none">
+									<button class="btn active" id="original-size">Use original size</button>
+									<button class="btn" id="same-size">Scale to same size</button>
+								</div>
+
 								<br/>
 								<br/>
 

resemble.js

@@ -88,6 +88,7 @@ URL: https://github.com/Huddle/Resemble.js
 
 		var ignoreAntialiasing = false;
 		var ignoreColors = false;
+		var scaleToSameSize = false;
 
 		function triggerDataUpdate(){
 			var len = updateCallbackArray.length;
@@ -165,6 +166,12 @@ URL: https://github.com/Huddle/Resemble.js
 
 				var hiddenCanvas =  document.createElement('canvas');
 				var imageData;
+
+				if( scaleToSameSize && images.length == 1 ){
+					hiddenImage.width 	= images[0].width;
+					hiddenImage.height 	= images[0].height;
+				}
+
 				var width = hiddenImage.width;
 				var height = hiddenImage.height;
 
@@ -584,6 +591,18 @@ URL: https://github.com/Huddle/Resemble.js
 			}
 
 			var self = {
+				scaleToSameSize: function(){
+					scaleToSameSize = true;
+
+					if(hasMethod) { param(); }
+					return self;
+				},
+				useOriginalSize: function(){
+					scaleToSameSize = false;
+
+					if(hasMethod) { param(); }
+					return self;
+				},
 				ignoreNothing: function(){
 
 					tolerance.red = 0;