diff --git a/src/stojg/crop/Crop.php b/src/stojg/crop/Crop.php
index 9379447..c16181a 100644
--- a/src/stojg/crop/Crop.php
+++ b/src/stojg/crop/Crop.php
@@ -55,9 +55,22 @@ public static function mark()
      * @param string $imagePath - The path to an image to load. Paths can include wildcards for file names,
      *							  or can be URLs.
      */
-    public function __construct($imagePath)
+    public function __construct($imagePath = null)
     {
-        $this->originalImage = new \Imagick($imagePath);
+        if ($imagePath) {
+            $this->setImage(new \Imagick($imagePath));
+        }
+    }
+
+    /**
+     * Sets the object Image to be croped
+     *
+     * @param  \Imagick $image
+     * @return null
+     */
+    public function setImage(\Imagick $image)
+    {
+        $this->originalImage = $image;
 
         // set base image dimensions
         $this->setBaseDimensions(
diff --git a/tests/CropEntropyTest.php b/tests/CropEntropyTest.php
index 1d39bc3..316a5a5 100644
--- a/tests/CropEntropyTest.php
+++ b/tests/CropEntropyTest.php
@@ -4,48 +4,65 @@
 require_once 'src/stojg/crop/CropCenter.php';
 require_once 'src/stojg/crop/CropEntropy.php';
 
+use stojg\crop\CropEntropy;
+
 class ClassEntropyTest extends PHPUnit_Framework_TestCase {
-	
-	/**
-	 *
-	 * @var string 
-	 */
-	protected $tempDir = '';
-	
-	public function setUp() {
-		if (!extension_loaded('imagick')) {
+    
+    const EXAMPLE_IMAGE = '/images/side.png';
+
+    /**
+     *
+     * @var string 
+     */
+    protected $tempDir = '';
+    
+    public function setUp() {
+        if (!extension_loaded('imagick')) {
             $this->markTestSkipped('The imagick extension is not available.');
-			return;
+            return;
+        }
+         $this->tempDir = sys_get_temp_dir().DIRECTORY_SEPARATOR.'croptest';
+         
+         if(file_exists($this->tempDir)) {
+             $this->cleanup();
+         }
+         
+         if(!mkdir($this->tempDir)) {
+            $this->markTestSkipped('Can\'t create temp directory '. $this->tempDir .' skipping test');
+        }
+    }
+    
+    /**
+     * 
+     */
+    public function tearDown() {
+        $this->cleanup();
+    }
+    
+    public function testEntropy() {
+        $center = new CropEntropy(__DIR__ . self::EXAMPLE_IMAGE);
+        $croppedImage = $center->resizeAndCrop(200, 200);
+        $croppedImage->writeimage($this->tempDir.'/entropy-test.png');
+    }
+    
+    public function testEntropyWithPreviusImagick() {
+        $image = new Imagick(__DIR__ . self::EXAMPLE_IMAGE);
+
+        $center = new CropEntropy();
+        $center->setImage($image);
+
+        $croppedImage = $center->resizeAndCrop(200, 200);
+
+        $this->assertSame($image, $croppedImage);
+
+        $croppedImage->writeimage($this->tempDir.'/entropy-test.png');
+    }
+
+    private function cleanup() {
+        $testFiles = glob($this->tempDir.DIRECTORY_SEPARATOR.'*');
+        foreach($testFiles as $file) {
+            unlink($file);
         }
-		 $this->tempDir = sys_get_temp_dir().DIRECTORY_SEPARATOR.'croptest';
-		 
-		 if(file_exists($this->tempDir)) {
-			 $this->cleanup();
-		 }
-		 
-		 if(!mkdir($this->tempDir)) {
-			$this->markTestSkipped('Can\'t create temp directory '. $this->tempDir .' skipping test');
-		}
-	}
-	
-	/**
-	 * 
-	 */
-	public function tearDown() {
-		$this->cleanup();
-	}
-	
-	public function testEntropy() {
-		$center = new \stojg\crop\CropEntropy(__DIR__.'/images/side.png');
-		$croppedImage = $center->resizeAndCrop(200, 200);
-		$croppedImage->writeimage($this->tempDir.'/entropy-test.png');
-	}
-	
-	private function cleanup() {
-		$testFiles = glob($this->tempDir.DIRECTORY_SEPARATOR.'*');
-		foreach($testFiles as $file) {
-			unlink($file);
-		}
-		rmdir($this->tempDir);
-	}
+        rmdir($this->tempDir);
+    }
 }