- Click Render tab
Render panel 
Advanced Render Settings.
At the Command prompt, enter RPREF. - In the Advanced Render Settings palette, on the Render Context title bar, turn on Save Rendering to File (click the button).
- Click the [...] button next to the Output File Name field.
- In the Render Output File dialog box, select a file type and the location where you want the image saved. Click Save.
- Click Render tab Render panel Render. At the Command prompt, enter RENDER.
As the rendering is completed, the image appears in the Render Window. It is also saved as a file.