diff --git a/src/Gmagick/Effects.php b/src/Gmagick/Effects.php
index f62cc42ae..d918c5779 100644
--- a/src/Gmagick/Effects.php
+++ b/src/Gmagick/Effects.php
@@ -82,7 +82,7 @@ public function negative()
     public function grayscale()
     {
         try {
-            $this->gmagick->setImageType(2);
+            $this->gmagick->setimagetype(2);
         } catch (\GmagickException $e) {
             throw new RuntimeException('Failed to grayscale the image', $e->getCode(), $e);
         }
@@ -118,7 +118,7 @@ public function sharpen()
     public function blur($sigma = 1)
     {
         try {
-            $this->gmagick->blurImage(0, $sigma);
+            $this->gmagick->blurimage(0, $sigma);
         } catch (\GmagickException $e) {
             throw new RuntimeException('Failed to blur the image', $e->getCode(), $e);
         }
@@ -168,7 +168,7 @@ public function convolve(Matrix $matrix)
         }
         try {
             $this->gmagick->convolveimage($matrix->getValueList());
-        } catch (\ImagickException $e) {
+        } catch (\GmagickException $e) {
             throw new RuntimeException('Failed to convolve the image');
         }
 
diff --git a/tests/tests/Gmagick/EffectsTest.php b/tests/tests/Gmagick/EffectsTest.php
index ac86301c7..04ec0d68e 100644
--- a/tests/tests/Gmagick/EffectsTest.php
+++ b/tests/tests/Gmagick/EffectsTest.php
@@ -40,7 +40,7 @@ protected function setUpBase()
      */
     public function testColorize()
     {
-        $this->isGoingToThrowException('Imagine\Exception\RuntimeException');
+        $this->isGoingToThrowException('Imagine\Exception\NotSupportedException');
         parent::testColorize();
     }