From 54462c777fc5f7412f402570a59813df9dfd5df0 Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.net>
Date: Fri, 1 Mar 2013 21:06:06 +0100
Subject: [PATCH] added quality param for png format

---
 src/Intervention/Image/Image.php |  7 ++++++-
 tests/ImageTest.php              | 12 ++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/Intervention/Image/Image.php b/src/Intervention/Image/Image.php
index 3336cfd3..234ad621 100644
--- a/src/Intervention/Image/Image.php
+++ b/src/Intervention/Image/Image.php
@@ -666,6 +666,10 @@ class Image
      */
     private function data($type = null, $quality = 90)
     {
+        if ($quality < 0 || $quality > 100) {
+            throw new Exception('Quality of image must range from 0 to 100.');
+        }
+
         ob_start();
 
         switch (strtolower($type)) {
@@ -674,9 +678,10 @@ class Image
             break;
 
             case 'png':
+                $quality = round($quality / 11.11111111111); // transform quality to png setting
                 @imagealphablending($this->resource, false);
                 @imagesavealpha($this->resource, true);
-                @imagepng($this->resource);
+                @imagepng($this->resource, null, $quality);
             break;
 
             default:
diff --git a/tests/ImageTest.php b/tests/ImageTest.php
index f35e42c2..6bd0506b 100644
--- a/tests/ImageTest.php
+++ b/tests/ImageTest.php
@@ -335,6 +335,18 @@ class ImageTest extends PHPUnit_Framework_Testcase
         $img->save($save_as);
         $this->assertFileExists($save_as);
         @unlink($save_as);
+
+        $save_as = 'public/test2.png';
+        $img = $this->getTestImage();
+        $img->save($save_as, 80);
+        $this->assertFileExists($save_as);
+        @unlink($save_as);
+
+        $save_as = 'public/test2.jpg';
+        $img = $this->getTestImage();
+        $img->save($save_as, 0);
+        $this->assertFileExists($save_as);
+        @unlink($save_as);
     }
 
     public function testStringConversion()