[CodeIgniter]Watermarking images dinamically

Good day everyone. I tried searching how to watermark an image from my database when display on web. i found some but it only watermarks then save into another folder. I don’t want the watermark to be permanent. i only want it to display when i view it into the web. can anyone help me? tnx

@mods, if i’m in the wrong section please transfer. tnx