Resize and Watermark a JPG with a PNG using PHP GD2

Post by **darknkreepy3#** » Sat Jul 27, 2013 11:26 pm

Allowing people to see images and save them with a dynamic watermark without having to add them to thousands of images.

TUTORIAL FILES HERE http://www.supercala.net/tuts/gd2-png_jpg_watermark.zip

show.php

<?php

	$imgF="test.jpg";
	$imgWM="logo.png";
	
?>
<html>
		<head>
			<link type="text/css" rel="stylesheet" href="show.css" />
		</head>
		<body>
			<h3>image</h3>
			<img src="<?php echo $imgF;?>" width="64px" />
			<h3>watermark</h3>
			<img src="<?php echo $imgWM;?>" width="64px" />
		
			<h3>resampled image</h3>
			<img src="generate.php" />
		</body>
</html>

generate.php

Code: Select all

<?php
	/*
	generate.php v1.0 by Kristoffe Brodeur. ©2013 All Rights Reserved.
	07-27-2013
	*/

	$imgOrig="test.jpg";
	$imgWM="logo.png";
	$quality=100;
	
	//new image
	$maxW=200;
	$maxH=200;
	list($imgW,$imgH)=getimagesize($imgOrig);
	//proportion check
	if($imgW>$maxW)
		{
		$propW=$maxW/$imgW;
		$newH1=$imgH*$propW;
		//a crop needs to be made, it does not fit the 240:160 proportion
		if($newH1>$maxH)
			{
			$median=($newH1-$maxH)/2;
			$srcY=$median/$propW;
			}
		}
	else
		{
		$srcY=0;
		}
	$srcH=$maxH*($imgW/$maxW);
	$imgCanvas=imagecreatetruecolor($maxW,$maxH);
	//imagealphablending($imgCanvas,false);
	
	$imgSrc=imagecreatefromjpeg($imgOrig);
	imagecopyresampled($imgCanvas,$imgSrc,0,0,0,$srcY,$maxW,$maxH,$imgW,$srcH);
	
	//watermark
	list($wmW,$wmH)=getimagesize($imgWM);
	$wm_temp=imagecreatefrompng($imgWM);

	imagecopy($imgCanvas,$wm_temp,0,0,0,0,$wmW,$wmH);
	
	header('Content-type:image/jpg');
	imagejpeg($imgCanvas,NULL,$quality);//NULL could have the finished filename instead
?>