Script author: jon
Watermarks usage
     It is shown in this example how to create an image with watermarks usage by means of php-scripts. Script displays the original image and the same image, but with a watermark on the page. Script uses the features of graphics library GD to carry out this function. The source code of this example is shown below.

In the template of the page:

<div align="center">
    <p>
        <b>This example shows the way of using the script to create an image with a watermark</b>
    </p>
</div>
<hr>
<?$PHPCODE$("http://phpexample.ucoz.com/php/example004/example004.php")?>


PHP-scripts of this example:

example004.php:

<b>The source mage:</b><br><hr>
<center><img src="http://phpexample.ucoz.com/php/example004/image.php?main=main.jpg"></center><br><hr>
<b>The image with a watermark:</b><br><hr>
<center><img src="http://phpexample.ucoz.com/php/example004/image.php?main=main.jpg&watermark=watermark.png"></center><br><hr>


image.php:

<?
        $___notjson=1;
        include 'api.watermark.php';
        $watermark = new watermark();
        $main_img_obj = imagecreatefromjpeg($_GET['main']);
        $watermark_img_obj = imagecreatefrompng($_GET['watermark']);
        $return_img_obj = $watermark->create_watermark($main_img_obj, $watermark_img_obj, 66);
        header('Content-Type: image/jpeg');
        header('Content-Disposition: inline; filename=' . $_GET['src']);
        imagejpeg($return_img_obj, '', 50);
?>

api.watermark.php:

<?
class watermark{
        function create_watermark( $main_img_obj, $watermark_img_obj, $alpha_level = 100 ) {
                $alpha_level        /= 100;
                $main_img_obj_w        = imagesx( $main_img_obj );
                $main_img_obj_h        = imagesy( $main_img_obj );
                $watermark_img_obj_w        = imagesx( $watermark_img_obj );
                $watermark_img_obj_h        = imagesy( $watermark_img_obj );
                $main_img_obj_min_x        = floor( ( $main_img_obj_w / 2 ) - ( $watermark_img_obj_w / 2 ) );
                $main_img_obj_max_x        = ceil( ( $main_img_obj_w / 2 ) + ( $watermark_img_obj_w / 2 ) );
                $main_img_obj_min_y        = floor( ( $main_img_obj_h / 2 ) - ( $watermark_img_obj_h / 2 ) );
                $main_img_obj_max_y        = ceil( ( $main_img_obj_h / 2 ) + ( $watermark_img_obj_h / 2 ) );

                $return_img        = imagecreatetruecolor( $main_img_obj_w, $main_img_obj_h );

                for( $y = 0; $y < $main_img_obj_h; $y++ ) {
                        for( $x = 0; $x < $main_img_obj_w; $x++ ) {
                                $return_color        = NULL;
                                $watermark_x        = $x - $main_img_obj_min_x;
                                $watermark_y        = $y - $main_img_obj_min_y;
                                $main_rgb = imagecolorsforindex( $main_img_obj, imagecolorat( $main_img_obj, $x, $y ) );
                                if ($watermark_x >= 0 && $watermark_x < $watermark_img_obj_w &&
                                                        $watermark_y >= 0 && $watermark_y < $watermark_img_obj_h ) {
                                        $watermark_rbg = imagecolorsforindex( $watermark_img_obj, imagecolorat( $watermark_img_obj, $watermark_x, $watermark_y ));
                                        $watermark_alpha = round( ( ( 127 - $watermark_rbg['alpha'] ) / 127 ), 2 );
                                        $watermark_alpha = $watermark_alpha * $alpha_level;
                                        $avg_red = $this->_get_ave_color( $main_rgb['red'], $watermark_rbg['red'], $watermark_alpha );
                                        $avg_green = $this->_get_ave_color( $main_rgb['green'], $watermark_rbg['green'], $watermark_alpha );
                                        $avg_blue = $this->_get_ave_color( $main_rgb['blue'], $watermark_rbg['blue'], $watermark_alpha );
                                        $return_color = $this->_get_image_color( $return_img, $avg_red, $avg_green, $avg_blue );
                                } else {
                                        $return_color = imagecolorat( $main_img_obj, $x, $y );
                                }
                                imagesetpixel( $return_img, $x, $y, $return_color );
                        }
                }
                return $return_img;
        }

        function _get_ave_color( $color_a, $color_b, $alpha_level ) {
                return round( ( ( $color_a * ( 1 - $alpha_level ) ) + ( $color_b        * $alpha_level ) ) );
        }

        function _get_image_color($im, $r, $g, $b) {
                $c=imagecolorexact($im, $r, $g, $b);
                if ($c!=-1) return $c;
                $c=imagecolorallocate($im, $r, $g, $b);
                if ($c!=-1) return $c;
                return imagecolorclosest($im, $r, $g, $b);
        }
}
?>

Date 18.02.2011
Download this example
Comments:
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Attila Spam 23.03.2013 22:05
You can get the original pic without the watermark; just type this:

http://phpexample.ucoz.com/php/example004/image.php?main=main.jpg
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