Index: GD.php
===================================================================
RCS file: /repository/pear/Image_Transform/Driver/GD.php,v
retrieving revision 1.11
diff -u -r1.11 GD.php
--- GD.php	23 Oct 2002 09:32:28 -0000	1.11
+++ GD.php	29 Dec 2002 06:01:46 -0000
@@ -1,4 +1,4 @@
-<?php
+<?php /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
 // +----------------------------------------------------------------------+
 // | PHP Version 4                                                        |
 // +----------------------------------------------------------------------+
@@ -17,8 +17,9 @@
 // +----------------------------------------------------------------------+
 //
 //    Usage :
-//    $img    = new Image_Transform_GD();
+//    $img    = new Image_Transform_Driver_GD();
 //    $angle  = -78;
+//    # file must exists!
 //    $img->load('magick.png');
 //
 //    if($img->rotate($angle,array('autoresize'=>true,'color_mask'=>array(255,0,0)))){
@@ -74,8 +75,13 @@
      */
     function load($image)
     {
-        $this->image = $image;
-        $this->_get_image_details($image);
+        $this->image    = $image;
+        $imageDetails   = $this->_get_image_details($image);
+
+        if (PEAR::isError($imageDetails)) {
+            return PEAR::raiseError($imageDetails->getMessage(), true);
+        }
+
         $functionName = 'ImageCreateFrom' . $this->type;
         $this->imageHandle = $functionName($this->image);
     } // End load
@@ -98,7 +104,7 @@
      * @return none
      * @see PEAR::isError()
      */
-	function addText($params)
+    function addText($params)
     {
 		$default_params = array(
                                 'text' => 'This is Text',
@@ -398,6 +404,87 @@
         $this->resized = false;
         ImageDestroy($this->old_image);
         $this->free();
+    }
+
+    /**
+    * Turn image to Grayscale
+    *
+    * The basic of grayscale is that we must turn 3 colors into 1 color.
+    *
+    * So, if you sum R+B+G and / 3 you will get just one color and you
+    * should use this new color in R, B and G.
+    *
+    * But, I found on the http://www.thecodeproject.com/cs/media/csharpgraphicfilters11.asp
+    * that if I multiple, instead of multiple by 1/3, each color by .229, .587 and .114
+    * and add +3 on the color index, we will get a better image. I have not sure the why.
+    *
+    * @param    float $rateR        the rate of Red in the new color ($rateR/1000)
+    * @param    float $rateG        the rate of Green in the new color ($rateG/1000)
+    * @param    float $rateB        the rate of Blue in the new color ($rateB/1000)        
+    * @param    int $whiteness      add more some int on the new color ($newcolor += $whiteness)
+    */ 
+    function grayscale($rateR = .229, $rateG = .587, $rateB = .114, $whiteness = 3)
+    {
+        // getting number of colors on index
+        $numColors = imagecolorstotal($this->imageHandle);
+
+        for ($x = 0; $x < $numColors; $x++) {
+            $src_colors = imagecolorsforindex($this->imageHandle,$x);
+            $new_color  = min(255,abs($src_colors["red"] * $rateR + $src_colors["green"] * $rateG + $src_colors["blue"] * $rateB) + $whiteness);
+            imagecolorset($this->imageHandle,$x,$new_color,$new_color,$new_color);
+        }
+    }
+
+    /**
+    * Sepia - make image pretends to be older than it really is
+    *
+    * It basicly turn the image grayscale and add some defined
+    * tint on it: R += 30, G += 43, B += -23, so it will appear a very old picture.
+    *
+    * @param    int $tintR          how much Red to add
+    * @param    int $tintG          how much Green to add
+    * @param    int $tintB          how much Blue to add
+    * @param    float $rateR        the rate of Red in the new color ($rateR/1000)
+    * @param    float $rateG        the rate of Green in the new color ($rateG/1000)
+    * @param    float $rateB        the rate of Blue in the new color ($rateB/1000)
+    * @param    int $whiteness      add more some int on the new color ($newcolor += $whiteness)
+    */
+    function sepia($tintR = 80,$tintG = 43,$tingB = -23,$rateR = .229,$rateG = .587,$rateB = .114,$whiteness = 3)
+    {
+        // getting number of colors on index
+        $numColors = imagecolorstotal($this->imageHandle);
+
+        for ($x = 0; $x < $numColors; $x++) {
+            $src_colors     = imagecolorsforindex($this->imageHandle,$x);
+            $new_color      = min(255,abs($src_colors["red"] * $rateR + $src_colors["green"] * $rateG + $src_colors["blue"] * $rateB) + $whiteness);
+            $r              = min(255,$new_color + $tintR);
+            $g              = min(255,$new_color + $tintG);
+            $b              = min(255,$new_color + $tintB);
+            imagecolorset($this->imageHandle,$x,$r,$g,$b);
+        }
+    }
+
+    /**
+      * Add more yellow
+      *
+      * It adds a layout of yellow that can be transparent or solid
+      * If $intensityA is 255 the image will be 0% transparent (solid).
+      *
+      * @param    int $intensityA        how much strong it will be the yellow (Red and Green) (Something between 0-255)
+      * @param    int $intensityB        how much weak will be the Blue (>= 2, in the positive limit it will be make BLUE be 0)
+      */
+    function yelloize($intensityA = 50,$intensityB = 3)
+    {
+        // getting number of colors on index
+        $numColors = imagecolorstotal($this->imageHandle);
+
+        for ($x = 0; $x < $numColors; $x++) {
+            $src_colors     = imagecolorsforindex($this->imageHandle,$x);
+            $r              = min($src_colors["red"] + $intensityA,255);
+            $g              = min($src_colors["green"] + $intensityA,255);
+            $b              = max(($r + $g) / max($intensityB,2),0);
+            imagecolorset($this->imageHandle,$x,$r,$g,$b);
+        }
     }
 
     /**