Hello, I try to display the watermark on the photo. The code I created a watermark displays, unfortunately the full-page displays. Lose content, etc.
Can you tell me how to properly insert and displays a watermark in the picture? Thank you.
Sorry about my English ...

class Fotka extends DataObject {
    static $db = array (
        'Popis' => 'Text',
        'DatumVlozeni' => 'Date'
    );
 
    static $has_one = array (
        'Attachment' => 'Image', 
        'PodKategorie2' => 'PodKategorie2'
    );

   ... 
   public function Watermark(GD $gd) {
        $temp = $this->Attachment();
        $watermark = imagecreatefromjpeg(Director::absoluteBaseURL().'mysite/code/water.jpg');
        $imageToWatermark = imagecreatefromjpeg(Director::absoluteBaseURL().$temp->Filename);
        $imagewatermark_width = imagesx($imageToWatermark);
        imagecopymerge($imageToWatermark, $watermark, 39, 45, 0, 0, 400, 400, 40);
        $tm = imagejpeg($imageToWatermark);
        $GDoutput= new GD($temp->Filename); 
        // return $tm;
        return $GDoutput;
   }

My Template PodKategorie2.ss

$Content
<% control Fotky %>
<ul>
	<li>$Popis</li>
	<li>$DatumVlozeni</li>
	<img="$Watermark"/>
</ul>
<% end_control %>

Hi,

could you try...
return $temp->Filename;
(in Watermark)

and...
<img src="$Watermark"/>
(in the template)

instead?

Thank you for reply, unfortunately the result is the same. I still have a page on the picture.
It's a simple thing to me:

I need to present images to all users. But for registered users will have the opportunity to download images without the watermark. So I thought the simple way is, insert a watermark ...

What is "Fotky" is that an instance of Fotka?

what you are doing looks right with the watermark code (I've used that before), but there is quite a bit of missing detail about the "PodKategorie2" page, please post that too.

Here is

class PodKategorie2 extends Page {
    
    static $has_many = array (
        'Fotky' => 'Fotka'
    );
    
    public function getCMSFields()
    {
        $f = parent::getCMSFields();
        
        $manager = new ImageDataObjectManager(
            $this, // Controller
            'Fotky', // Source name
            'Fotka', // Source class
            'Attachment', // File name on DataObject
            null, // Headings 
            'getCMSFields_forPopup' // Detail fields
            // Filter clause
            // Sort clause
            // Join clause
        );
          
         
        $f->addFieldToTab("Root.Content.Gallery",$manager);
        return $f;
    }
}

class PodKategorie2_Controller extends Page_Controller {
    
}

Finally, it has helped create a class WatermarkImage that inherits the image. GetWatermark method, which finally displays a watermark.

class WatermarkImage extends Image {
 function getWatermark() {
     $watermark = imagecreatefromjpeg(Director::absoluteBaseURL().'mysite/code/watermark.jpg');
        $watermark_width = imagesx($watermark); 
        $watermark_height = imagesy($watermark); 
        $image = imagecreatetruecolor($watermark_width, $watermark_height); 
        $image = imagecreatefromjpeg(str_replace('/','\\',Director::baseFolder().'/'.$this->Filename));
        $size = getimagesize(str_replace('/','\\',Director::baseFolder().'/'.$this->Filename));
        $dest_x = $size[0] - $watermark_width - 5; 
        $dest_y = $size[1] - $watermark_height - 5; 
        imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 40);
        imagejpeg($image,str_replace('/','\\',Director::baseFolder().'/'.$this->Filename));
        imagedestroy($image); 
        imagedestroy($watermark);
 }
}

<% control Images %>

            $Attachment.SetRatioSize(150,150)
            $Attachment.getWatermark
            
<% end_control %>