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put a png watermark on an image jpg

Posted on 2010-08-18
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Medium Priority
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Last Modified: 2012-05-10
could I put a png image over a jpg image


png image top
jpg image bottom


I think the attached code puts a gif over a jpg
watermarkImage("$filename");


 
function watermarkImage($location)
{
 
//load watermark image
$watermark = imagecreatefromgif("uploaded/canon.gif");
$watermark_height = imagesy($watermark);
$watermark_width = imagesx($watermark); 
 
$image = imagecreatetruecolor($watermark_width, $watermark_height);
$image = imagecreatefromgif($location);
 
$size = getimagesize($location);
 
$x_pos = $size[0] - $watermark_width;
$y_pos = $size[1] - $watermark_height;


imagecopymerge($image,$watermark, $x_pos, $y_pos, 0, 0, $watermark_width, $watermark_height, 100);
imagegif($image, $location,100);



 
imagedestroy($image);
imagedestroy($watermark);
 
}

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Question by:rgb192
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6 Comments
 
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Expert Comment

by:captainmish
ID: 33468807
Just needs a few lines replaced in that code to use png and jpg::


/*
 * Usage: watermarkImage(path to jpg image, path to watermark png);
 */

 
function watermarkImage($locationjpg, $watermarkpng)
{
 
//load watermark image
$watermark = imagecreatefrompng($watermarkpng);
$watermark_height = imagesy($watermark);
$watermark_width = imagesx($watermark); 
 
$image = imagecreatetruecolor($watermark_width, $watermark_height);
$image = imagecreatefromjpeg($locationjpg);
 
$size = getimagesize($locationjpg);
 
$x_pos = $size[0] - $watermark_width;
$y_pos = $size[1] - $watermark_height;


imagecopymerge($image,$watermark, $x_pos, $y_pos, 0, 0, $watermark_width, $watermark_height, 100);
imagegif($image, $locationjpg,100);



 
imagedestroy($image);
imagedestroy($watermark);
 
}

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Accepted Solution

by:
captainmish earned 1000 total points
ID: 33468836
There are a few places i forgot to replace $watermark with $watermarkpng :
/*
 * Usage: watermarkImage(path to jpg image, path to watermark png);
 */

 
function watermarkImage($locationjpg, $watermarkpng)
{
 
//load watermark image
$watermark = imagecreatefrompng($watermarkpng);
$watermark_height = imagesy($watermarkpng);
$watermark_width = imagesx($watermarkpng); 
 
$image = imagecreatetruecolor($watermark_width, $watermark_height);
$image = imagecreatefromjpeg($locationjpg);
 
$size = getimagesize($locationjpg);
 
$x_pos = $size[0] - $watermark_width;
$y_pos = $size[1] - $watermark_height;


imagecopymerge($image,$watermarkpng, $x_pos, $y_pos, 0, 0, $watermark_width, $watermark_height, 100);
imagegif($image, $locationjpg,100);



 
imagedestroy($image);
imagedestroy($watermarkpng);
 
}

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Author Comment

by:rgb192
ID: 33469124
you replaced variablename


this does not work
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LVL 3

Expert Comment

by:captainmish
ID: 33469164
as well as the imagecreatefrom functions: jpeg and png, not gif - the variable name changes were to try and make this more obvious: imagecreatefrom*PNG* imagecreatefrom*JPEG*

http://php.net/manual/en/function.imagecreatefrompng.php

http://php.net/manual/en/function.imagecreatefromjpeg.php
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LVL 111

Assisted Solution

by:Ray Paseur
Ray Paseur earned 1000 total points
ID: 33470122
A tested and working example is available here:
http://www.laprbass.com/RAY_image_watermark.php
<?php // RAY_image_watermark.php
error_reporting(E_ALL);

// LOCATION OF THE IMAGES
$original = 'http://www.LAPRBass.com/RAY_add_watermark_source_image.jpg';
$h2o_mark = 'http://www.LAPRBass.com/RAY_add_watermark_watermark_image.png'; 

// MAN PAGE http://us3.php.net/manual/en/function.imagecreatefromjpeg.php
$im = ImageCreateFromJPEG($original);
// MAN PAGE http://us3.php.net/manual/en/function.imagecreatefrompng.php
$wm = ImageCreateFromPNG($h2o_mark);

// ADD WATERMARK
imagelogo($im, $wm, imagesx($im), imagesy($im), imagesx($wm), imagesy($wm));

// SHOW THE IMAGE
header('Content-type: image/jpg');
ImageJPEG($im);

// SEE http://us3.php.net/manual/en/function.imagealphablending.php#77085
function imagelogo (&$dst_image, $src_image, $dst_w, $dst_h, $src_w, $src_h) 
{
    ImageAlphaBlending($dst_image,TRUE);
    ImageAlphaBlending($src_image,TRUE);
    ImageCopy($dst_image, $src_image, ($dst_w-$src_w), ($dst_h-$src_h), 0, 0, $src_w, $src_h);
}

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Author Closing Comment

by:rgb192
ID: 33582750
thanks
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