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<?
function pngcolorizealpha($file, $color) {
/*
Function: pngcolorizealpha
Author: CoD (cod at crescentofdarkness dot cjb dot net)
Summary: Blends a truecolor png image with a coloured background using alpha channel
Input:
--------------------------
$file - string - path to the png image
$color- string - color in hex notation, without the #
Output:
--------------------------
a png image
*/
// first of all let's convert the background color
$background = array(
'red' => hexdec(substr($color,0,2)),
'green' => hexdec(substr($color,2,2)),
'blue' => hexdec(substr($color,4,2))
);
$im1 = imagecreatefrompng($file) or die('Cannot Initialize new GD image stream');
$im2 = imagecreatetruecolor(imagesx($im1), imagesy($im1));
$col1 = imagecolorallocate($im2, $background['red'], $background['green'], $background['blue']);
imagefill($im2,0,0,$col1);
// for each color in the original png
for ($i=0; $i< imagecolorstotal($im1); $i++) {
// find r,g,b and alpha value
$foreground = imagecolorsforindex($im1, $i);
// blend fore and back colors using alpha value
$r = (($foreground['red'] / 127) * (127 - $foreground['alpha'])) + (($background['red'] / 127)* $foreground['alpha']);
$g = (($foreground['green'] / 127) * (127 - $foreground['alpha'])) + (($background['green'] / 127)* $foreground['alpha']);
$b = (($foreground['blue'] / 127) * (127 - $foreground['alpha'])) + (($background['blue'] / 127)* $foreground['alpha']);
// allocate this new color in the destination image
imagecolorallocate($im2, $r,$g,$b);
}
imagecopy($im2, $im1, 0, 0, 0, 0, imagesx($im1), imagesy($im1));
header ("Content-type: image/png");
imagepng($im2);
imagedestroy($im1);
imagedestroy($im2);
}
/*
$bild = imagecreatefrompng('images/footer.png');
header('Content-Type: image/png');
$img = $bild;
$white = imagecolorallocate( $img, 255, 255, 255 );
imagefill( $img, 0, 0, $white );
imagepng($img); */
if(isset($_GET['file']) && isset($_GET['color'])){
if($_GET['file'] != 'background.png' && $_GET['file'] != "footer.png" && $_GET['file'] != "header.png"){
die;
}
pngcolorizealpha('images/'.$_GET['file'],$_GET['color']);
}
else{
require_once('gradient.class.php');
$image = new gd_gradient_fill(680,61,"vertical",$_GET['color1'],$_GET['color2'],0);
header('Content-Type:image/png');
imagepng($image);
}
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