From the Rendering menu, choose Print Size Assistant.
Choose a preset paper size, or specify a custom size in inches or millimeters. Alternatively, specify an image size in pixels.
Choose or specify a DPI (dots per inch) ratio for the printed output.
Choose an output orientation: Portrait or Landscape.
When ready to render to a file, turn on Save File, click the Files button, and use the resulting Select TIFF File dialog to specify an output image file.
Do one of the following:
To render immediately, click Render.
To set further rendering properties, click Render Setup.
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About the Print Size Wizard
The Print Size Wizard feature is useful when you plan to print a rendered image. It lets you specify output size, resolution, and orientation in terms of the printed image; that is, using a standard measuring system rather than pixels.