From this comment:
Sry, i forgot it, but i want size of 645×445, exactly, and that image dont have it. The width of it is 588px. Look: img201.imageshack.us/img201/4728/40405258.png WordPress need make a zoom on it.
WordPress does not zoom. It only crops. If you want an image to have a custom intermediate size, then you must upload an image with dimensions greater than or equal to the dimensions specified in your add_image_size() call.
Also: if you have uploaded images prior to adding your add_image_size() call, then you will need to regenerate your intermediate image files in order for WordPress to create images using your custom size.