Resolves bug address by PR #70. Removes defensive CORS from e6dab9aaf0 and optimisation a1a41fc526. Works for me.

demoassets/main.js

@@ -108,6 +108,9 @@ $(function(){
 			resembleControl.ignoreNothing();
 		}
 		else
+		if($this.is('#less')){
+			resembleControl.ignoreLess();
+		}
 		if($this.is('#colors')){
 			resembleControl.ignoreColors();
 		}

index.html

@@ -89,7 +89,8 @@
 								<br/>
 
 								<div class="btn-group buttons" style="display:none">
-									<button class="btn active" id="raw">Ignore nothing</button>
+									<button class="btn" id="raw">Ignore nothing</button>
+									<button class="btn active" id="less">Ignore less</button>
 									<button class="btn" id="colors">Ignore colors</button>
 									<button class="btn" id="antialising">Ignore antialiasing</button>
 								</div>

resemble.js

@@ -148,17 +148,9 @@ URL: https://github.com/Huddle/Resemble.js
 		function loadImageData( fileData, callback ){
 			var fileReader;
 			var hiddenImage = new Image();
-			
-			if (!(typeof fileData === 'string' 
-				&& fileData.length > 6 
-				&& fileData.charAt(4)===':' 
-				&& fileData.charAt(5)!=='/'
-			)) {
-				if (httpRegex.test(fileData) && !documentDomainRegex.test(fileData)) {
-					hiddenImage.setAttribute('crossorigin', 'anonymous');
-				}
-			}
-			
+
+			hiddenImage.setAttribute('crossorigin', 'anonymous');
+
 			hiddenImage.onerror = function () { 
 				hiddenImage.onerror = null; //fixes pollution between calls
 				images.push({ error : "Image load error."});
@@ -622,6 +614,21 @@ URL: https://github.com/Huddle/Resemble.js
 					if(hasMethod) { param(); }
 					return self;
 				},
+				ignoreLess: function(){
+
+					tolerance.red = 16;
+					tolerance.green = 16;
+					tolerance.blue = 16;
+					tolerance.alpha = 16;
+					tolerance.minBrightness = 16;
+					tolerance.maxBrightness = 240;
+
+					ignoreAntialiasing = false;
+					ignoreColors = false;
+
+					if(hasMethod) { param(); }
+					return self;
+				},
 				ignoreAntialiasing: function(){
 
 					tolerance.red = 32;