From 4956f25b68724fce118c09f7924ada1874ffd97e Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.net>
Date: Wed, 11 Dec 2013 20:55:41 +0100
Subject: [PATCH] added gamma method

---
 src/Intervention/Image/Image.php | 14 ++++++++++++++
 tests/ImageTest.php              | 11 +++++++++++
 2 files changed, 25 insertions(+)

diff --git a/src/Intervention/Image/Image.php b/src/Intervention/Image/Image.php
index faee0006..ff992abb 100644
--- a/src/Intervention/Image/Image.php
+++ b/src/Intervention/Image/Image.php
@@ -1365,6 +1365,20 @@ class Image
         return $this;
     }
 
+    /**
+     * Applies gamma correction
+     *
+     * @param  float $input
+     * @param  float $output
+     * @return Image
+     */
+    public function gamma($input, $output)
+    {
+        imagegammacorrect($this->resource, $input, $output);
+
+        return $this;
+    }
+
     /**
      * Reset to original image resource
      *
diff --git a/tests/ImageTest.php b/tests/ImageTest.php
index 22fbf51a..b3015674 100644
--- a/tests/ImageTest.php
+++ b/tests/ImageTest.php
@@ -1400,6 +1400,17 @@ class ImageTest extends PHPUnit_Framework_Testcase
         $this->assertEquals(( ord($contents[28]) != '0' ), false);
     }
 
+    public function testGammaImage()
+    {
+        $img = Image::make('public/tile.png');
+        $img->gamma(1.0, 1.6);
+        $this->assertInstanceOf('Intervention\Image\Image', $img);
+        $color1 = $img->pickColor(0, 0, 'hex');
+        $color2 = $img->pickColor(10, 10, 'hex');
+        $this->assertEquals('#cdeb00', $color1);
+        $this->assertEquals('#707d8a', $color2);
+    }
+
     public function testSaveImage()
     {
         $save_as = 'public/test2.jpg';