Ghostscript supports a large number of graphic output formats. Ghostscript calls these devices. When your copy of the Macintosh port of Ghostscript was built, some devices were chosen to be included. Since there are over a hundred devices, generally not all were included. When you run the application, the devices that are included are listed in the 'Devices' menu. The first one is always 'mac', which is the device for rendering into a Macintosh window.
To use another device, and cause Ghostscript to render into a graphic file, choose the device from the Device menu, and then open the file as normal. This time, instead of a new window appearing, you will be asked to named a file to hold the output. The settings dialog can be used to set the page size and scaling options. Note that the image options have no effect on other devices. To switch back to rendering into a window, just choose 'mac' from the 'Devices' menu.
