added blur method

src/Intervention/Image/Image.php

@@ -1147,6 +1147,21 @@ class Image
         return $this;
     }
 
+    /**
+     * Apply blur filter on the current image
+     *
+     * @param  integer $amount
+     * @return Image
+     */
+    public function blur($amount = 1)
+    {
+        for ($i=0; $i < intval($amount); $i++) { 
+            imagefilter($this->resource, IMG_FILTER_GAUSSIAN_BLUR);
+        }
+
+        return $this;
+    }
+
     /**
      * Reset to original image resource
      *

tests/ImageTest.php

@@ -1004,6 +1004,14 @@ class ImageTest extends PHPUnit_Framework_Testcase
         $this->assertEquals('#000000', $img->pickColor(0, 0, 'hex'));
     }
 
+    public function testBlurImage()
+    {
+        $img = Image::make('public/tile.png')->blur();
+        $this->assertInstanceOf('Intervention\Image\Image', $img);
+        $this->assertEquals('#b4e000', $img->pickColor(0, 0, 'hex'));
+        $this->assertEquals('#98bc18', $img->pickColor(0, 7, 'hex'));
+    }
+
     public function testFillImage()
     {
         $img = new Image(null, 32, 32);