diff --git a/demoassets/main.js b/demoassets/main.js
index 8f44fdc..5f43e61 100644
--- a/demoassets/main.js
+++ b/demoassets/main.js
@@ -179,9 +179,9 @@ $(function(){
 			resembleControl.repaint();
 		}
 		else
-		if($this.is('#outputDiff')){
+		if($this.is('#diffOnly')){
 			resemble.outputSettings({
-				outputDiff: true
+				errorType: 'diffOnly'
 			});
 			resembleControl.repaint();
 		}
diff --git a/index.html b/index.html
index 827db2f..fab28ca 100644
--- a/index.html
+++ b/index.html
@@ -119,7 +119,7 @@
 									<button class="btn" id="movement">Movement</button>
 									<button class="btn" id="flatDifferenceIntensity">Flat with diff intensity</button>
 									<button class="btn" id="movementDifferenceIntensity">Movement with diff intensity</button>
-									<button class="btn" id="outputDiff">Diff portion from the input</button>
+									<button class="btn" id="diffOnly">Diff portion from the input</button>
 								</div>
 								<br/>
 								<br/>
diff --git a/resemble.js b/resemble.js
index 5eeae61..5278074 100644
--- a/resemble.js
+++ b/resemble.js
@@ -67,7 +67,7 @@ URL: https://github.com/Huddle/Resemble.js
 			px[offset + 2] = ((1 - ratio) * (d2.b * (errorPixelColor.blue / 255)) + ratio * errorPixelColor.blue);
 			px[offset + 3] = d2.a;
 		},
-		copySecondImage: function (px, offset, d1, d2) {
+		diffOnly: function (px, offset, d1, d2) {
 			px[offset] = d2.r;
 			px[offset + 1] = d2.g;
 			px[offset + 2] = d2.b;
@@ -76,10 +76,10 @@ URL: https://github.com/Huddle/Resemble.js
 	};
 
 	var errorPixel = errorPixelTransform.flat;
+	var errorType;
 	var boundingBox;
 	var largeImageThreshold = 1200;
 	var useCrossOrigin = true;
-	var outputDiff = false;
 	var document = typeof window != "undefined" ? window.document : {
 		createElement: function() {
 			// This will work as long as only createElement is used on window.document
@@ -374,7 +374,7 @@ URL: https://github.com/Huddle/Resemble.js
 		}
 
 		function copyPixel(px, offset, data){
-			if (outputDiff) {
+			if (errorType === 'diffOnly') {
 				return;
 			}
 
@@ -385,7 +385,7 @@ URL: https://github.com/Huddle/Resemble.js
 		}
 
 		function copyGrayScalePixel(px, offset, data){
-			if (outputDiff) {
+			if (errorType === 'diffOnly') {
 				return;
 			}
 
@@ -739,6 +739,7 @@ URL: https://github.com/Huddle/Resemble.js
 
 		if(options.errorType && errorPixelTransform[options.errorType] ){
 			errorPixel = errorPixelTransform[options.errorType];
+			errorType = options.errorType;
 		}
 
 		if(options.errorPixel && typeof options.errorPixel === "function") {
@@ -759,11 +760,6 @@ URL: https://github.com/Huddle/Resemble.js
 			boundingBox = options.boundingBox;
 		}
 
-		if (options.outputDiff) {
-			outputDiff = options.outputDiff;
-			errorPixel = errorPixelTransform.copySecondImage;
-		}
-
 		return this;
 	};