Shaun Shaun - 6 months ago 26
PHP Question

PHP watermark image

I am trying to watermark images on upload.

I have a multi upload script in place which works fine, see below:

$gallery=$_GET["gallery"];
$album=$_GET["album"];
if(isset($_FILES['files'])){
$errors= array();
foreach($_FILES['files']['tmp_name'] as $key => $tmp_name ){
$file_name = $key.$_FILES['files']['name'][$key];
$file_size =$_FILES['files']['size'][$key];
$file_tmp =$_FILES['files']['tmp_name'][$key];
$file_type=$_FILES['files']['type'][$key];
if($file_size > 2097152){
$errors[]='File size must be less than 2 MB';
}
$query="INSERT into commerce_images (`USER_ID`,`FILE_NAME`,`FILE_SIZE`,`FILE_TYPE`, `added_by`, `gallery_id`, `sub_gallery_id`)
VALUES('$user','$file_name','$file_size','$file_type', '$Fname $Sname', '$gallery', '$album'); ";
$desired_dir="uploads";
if(empty($errors)==true){
if(is_dir($desired_dir)==false){
mkdir("$desired_dir", 0700); // Create directory if it does not exist
}
if(is_dir("$desired_dir/".$file_name)==false){
move_uploaded_file($file_tmp,"$desired_dir/".$file_name);
}else{ // rename the file if another one exist
$new_dir="$desired_dir/".$file_name.time();
rename($file_tmp,$new_dir) ;
}
mysql_query($query);
}else{
print_r($errors);
}
}
if(empty($error)){
?>

<script>location.assign("commerce-images.php?state=new");</script>
<?php
}
}
?>


Is it possible to watermark all images uploaded using my script?

Answer

While OP's question wasnt crystal clear on the exact method of watermarking, im showing here text and image watermarking capabilities using the GD library.


Adding text as watermark (using TTF font): Gist

function add_text_watermark($kep,$Text,$WatermarkNeeded = 1) {
    list($img_type, $Image) = getImage($kep);

$sx = imagesx($Image) ;
$sy = imagesy($Image) ;

if ($WatermarkNeeded)
    { 
    /* Set the font */
    $Font="_arial.ttf";
    $FontColor = ImageColorAllocate ($Image,204,204,204) ;
    $FontShadow = ImageColorAllocate ($Image,100,100,100) ;
    $Rotation = 0 ;
    /* Make a copy image */
    $OriginalImage = ImageCreateTrueColor($sx,$sy) ;
    ImageCopy ($OriginalImage,$Image,0,0,0,0,$sx,$sy) ;

    /* Iterate to get the size up */
    $FontSize=1 ;
    do
        {
        $FontSize *= 1.1 ;
        $Box = @ImageTTFBBox($FontSize,0,$Font,$Text);
        $TextWidth = abs($Box[4] - $Box[0]) ;
        $TextHeight = abs($Box[5] - $Box[1]) ;
        }
    while ($TextWidth < $sx*0.9 && $FontSize < 30) ;
    /*  Awkward maths to get the origin of the text in the right place */
    $x = $sx/2 - cos(deg2rad($Rotation))*$TextWidth/2 ;
    $y = $sy/2 + sin(deg2rad($Rotation))*$TextWidth/2 + cos(deg2rad($Rotation))*$TextHeight/2 ;
    /* Make shadow text first followed by solid text */

    ImageTTFText ($Image,$FontSize,$Rotation,$x+1,$y+1,$FontShadow,$Font,$Text);
    ImageTTFText ($Image,$FontSize,$Rotation,$x,$y,$FontColor,$Font,$Text);

    /* merge original image into version with text to show image through text */
    ImageCopyMerge ($Image,$OriginalImage,0,0,0,0,$sx,$sy,50) ;
    imagejpeg($Image, $kep, 100);
    }
}

function getImage($res) {
    $img = "";
    $type = "";

    if (intval(@imagesx($res)) > 0) {
        $img = $res;
    } else {
        $imginfo = getimagesize($res);

        switch($imginfo[2]) { // Determine type
            case 1:
                $type = "GIF";
                if (function_exists("imagecreatefromgif")) {
                    $img = imagecreatefromgif($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
            case 2:
                $type = "JPG";
                if (function_exists("imagecreatefromjpeg")) {
                    $img = imagecreatefromjpeg($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
            case 3:
                $type = "PNG";
                if (function_exists("imagecreatefrompng")) {
                    $img = imagecreatefrompng($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
        }
    }

    return array($type, $img);
}

EDIT: make sure the ttf font file you are trying to add as watermark text are in sight of the path!


Adding Image as watermark: Gist

function generate_watermarked_image($originalFileContents, $originalWidth, $originalHeight, $paddingFromBottomRight = 0, $watermarkFileLocation = 'logo.png') {
$watermarkImage = imagecreatefrompng($watermarkFileLocation);
$watermarkWidth = imagesx($watermarkImage);  
$watermarkHeight = imagesy($watermarkImage);

$originalImage = imagecreatefromstring($originalFileContents);

$destX = $originalWidth - $watermarkWidth - $paddingFromBottomRight;  
$destY = $originalHeight - $watermarkHeight - $paddingFromBottomRight;

// creating a cut resource
$cut = imagecreatetruecolor($watermarkWidth, $watermarkHeight);

// copying that section of the background to the cut
imagecopy($cut, $originalImage, 0, 0, $destX, $destY, $watermarkWidth, $watermarkHeight);

// placing the watermark now
imagecopy($cut, $watermarkImage, 0, 0, 0, 0, $watermarkWidth, $watermarkHeight);

// merging both of the images
imagecopymerge($originalImage, $cut, $destX, $destY, 0, 0, $watermarkWidth, $watermarkHeight, 100);

return $originalImage;
}

You can call it as:

$Image = "$desired_dir/".$file_name;

imagejpeg(generate_watermarked_image(file_get_contents($Image), imagesx($Image), imagesy($Image), 10), $Image."-watermarked.jpg", 100);

EDIT: make sure the logo.png or whatever file you are trying to add as watermark are in sight of the path!