how to resize image and use watermark in the same time using image manipulation class ?

[eluser]Laith99[/eluser]
Hello guys

i'm using image manipulation class, i'm using 'dynamic_output' and it's necessary for my application. but i have a problem i want to resize an image and watermark it without saving it, i want only to resize and watermark the source image without affecting the source image. and i can't save a temporary image. for example i can't resize the image save it and watermark it again.

Thanks