Load image in separate file and draw in main. Processing 2.0

I'm trying to load the image in a separate class and draw it in the main draw function. I get such an error:

The method image(PImage, float, float) in the type PApplet is not applicable for the arguments (main.image, int, int)

Here is the Image class code:

class Image{

PImage img;

Image(){ 
img = new PImage(); 
img = loadImage("test.jpg"); }

}

And here is the main file:

Image img;

void setup(){ 
img = new Image(this); 
}

void draw(){ 
image(img, 0, 0); 
}

Can anyone help please?