Saves the current view to the specified image file. The view is re-rendered to the specified size and not just scaled from the existing view. This allows you to generate higher resolution images than you could do with just a screen capture.
"viewport_var" is a variable referencing a Viewport object. | 
        
"viewport_var" is a variable referencing a Viewport object. | 
        
| Type | Description | 
| boolean | Returns true if the operation was successful. | 
| Name | Type | Description | 
| options | SaveImageFileOptions | A SaveImageFileOptions object that defines the various options that define how the image should be created. The SaveImageFileOptions can be created by using the static create method on the SaveImageFileOptions class. |