From 0a4c4d5024c8efd6ede6079718bb9b0ae8eeba72 Mon Sep 17 00:00:00 2001
From: Francesco Marino <francesco.marino@cfengine.com>
Date: Wed, 8 Apr 2015 12:27:58 +0200
Subject: [PATCH 1/2] Update SimpleImage.php

I suggest to don't destroy the object after the output, in this way is still possible modify the image object and save several other different images: I had a situation in which I needed to show the resized version and save it, but right after that add a desaturation filter and save a second image without showing it (normal button + hover status).
---
 src/abeautifulsite/SimpleImage.php | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/abeautifulsite/SimpleImage.php b/src/abeautifulsite/SimpleImage.php
index 290010a..209ccb7 100644
--- a/src/abeautifulsite/SimpleImage.php
+++ b/src/abeautifulsite/SimpleImage.php
@@ -625,10 +625,6 @@ function output($format = null, $quality = null) {
                 throw new Exception('Unsupported image format: '.$this->filename);
                 break;
         }
-
-        // Since no more output can be sent, call the destructor to free up memory
-        $this->__destruct();
-
     }
 
     /**
@@ -1267,4 +1263,4 @@ protected function normalize_color($color) {
         return false;
     }
 
-}
\ No newline at end of file
+}

From bc0450630e4f86a998632ecf5cec7cc0b4ec79fd Mon Sep 17 00:00:00 2001
From: Francesco Marino <francesco.marino@cfengine.com>
Date: Wed, 8 Apr 2015 12:41:36 +0200
Subject: [PATCH 2/2] Update SimpleImage.php

Improved the desaturate function with a specifiable amount (0-1)
---
 src/abeautifulsite/SimpleImage.php | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/abeautifulsite/SimpleImage.php b/src/abeautifulsite/SimpleImage.php
index 209ccb7..ca34e7d 100644
--- a/src/abeautifulsite/SimpleImage.php
+++ b/src/abeautifulsite/SimpleImage.php
@@ -309,13 +309,26 @@ function crop($x1, $y1, $x2, $y2) {
     }
 
     /**
-     * Desaturate (grayscale)
+     * Desaturate (grayscale if nothing specified)
      *
      * @return SimpleImage
      *
      */
-    function desaturate() {
-        imagefilter($this->image, IMG_FILTER_GRAYSCALE);
+    function desaturate($amount=1) {
+        // Determine amount
+        $amount = $this->keep_within($amount, 0, 1) * 100;
+        
+        // Make a desaturated copy of the image
+        $new = imagecreatetruecolor($this->width, $this->height);
+        imagealphablending($new, false);
+        imagesavealpha($new, true);
+        imagecopy($new, $this->image, 0, 0, 0, 0, $this->width, $this->height);
+        imagefilter($new, IMG_FILTER_GRAYSCALE);
+        
+        // Merge with specified amount
+        $this->imagecopymerge_alpha($this->image, $new, 0, 0, 0, 0, $this->width, $this->height, $amount);
+        imagedestroy($new);
+        
         return $this;
     }