Re: Creating watermarks

["GP INTERACTIVE" <gpinteractive@xxxxxxxxx>]

you can use also the following function :

<?php

  // --- image play path
  $watermarkfile = 'images/play_small.png'; // as an example

  function getPictureMarked($sourcefile, $watermarkfile) {

    #
    # $sourcefile = Filename of the picture to be watermarked.
    # $watermarkfile = Filename of the 24-bit PNG watermark file.
    #

    //Get the resource ids of the pictures
    $watermarkfile_id = imagecreatefrompng($watermarkfile);

    imageAlphaBlending($watermarkfile_id, false);
    imageSaveAlpha($watermarkfile_id, true);

    $fileType = strtolower(substr($sourcefile, strlen($sourcefile)-3));

    switch($fileType) {
        case('gif'):
            $sourcefile_id = imagecreatefromgif($sourcefile);
            break;

        case('png'):
            $sourcefile_id = imagecreatefrompng($sourcefile);
            break;

        default:
            $sourcefile_id = imagecreatefromjpeg($sourcefile);
    }

    //Get the sizes of both pix
    $sourcefile_width=imageSX($sourcefile_id);
    $sourcefile_height=imageSY($sourcefile_id);
    $watermarkfile_width=imageSX($watermarkfile_id);
    $watermarkfile_height=imageSY($watermarkfile_id);

    $dest_x = ( $sourcefile_width / 2 ) - ( $watermarkfile_width / 2 );
    $dest_y = ( $sourcefile_height / 2 ) - ( $watermarkfile_height / 2 );

    // if a gif, we have to upsample it to a truecolor image
    if($fileType == 'gif') {
        // create an empty truecolor container
        $tempimage = imagecreatetruecolor($sourcefile_width,
$sourcefile_height);

        // copy the 8-bit gif into the truecolor image
        imagecopy($tempimage, $sourcefile_id, 0, 0, 0, 0, $sourcefile_width,
$sourcefile_height);

        // copy the source_id int
        $sourcefile_id = $tempimage;
    }

    imagecopy($sourcefile_id, $watermarkfile_id, $dest_x, $dest_y, 0, 0,
$watermarkfile_width, $watermarkfile_height);

    //Create a jpeg out of the modified picture
    switch($fileType) {

        // remember we don't need gif any more, so we use only png or jpeg.
        // See the upsaple code immediately above to see how we handle gifs
        case('png'):
            header("Content-type: image/png");
            imagepng ($sourcefile_id);
            break;

        default:
            header("Content-type: image/jpg");
            imagejpeg ($sourcefile_id);
    }

    imagedestroy($sourcefile_id);
    imagedestroy($watermarkfile_id);

}
?>

Regards,

Greg
http://www.psmdev.com


On 8/4/07, Tom Ray [Lists] <lists@xxxxxxxxxxxxxxxx> wrote:
>
> I've been learning how to use PHP with the GD Library and I've managed
> to learn quite a bit. I can upload, resize, create thumbnails and I'm
> even able to create "security code" images for forms. My question is how
> do I create a Watermark on the image? I want something transparent but
> still visible enough to see the copyright and the website. I want to put
> it in the center of the image. I would use a non-water marked image and
> when it's called on (depending on viewing size) I want the water mark to
> be added.
>
> How would one go about doing that?
>
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