Style: Image inspector
You can use this inspector to position an image inside a shape object.
Select the Image checkbox and then use the dialog that appears to browse for the image file you would like to apply to the object. You can also just drag an image file from another application and drop it on the image well in the inspector, or on the shape object itself. To remove the image, deselect the Image checkbox.
When you browse for an image file, you have the option of creating an alias (or "link") to the image instead of adding the image to the OmniGraffle file itself. If you do this, the OmniGraffle document depends on the original image file; the alias will not work if you delete the image file or open the document on a different computer. If an object's image comes from an alias, the Alias pop-up menu at the bottom of the inspector becomes enabled; you can use it to open the image file, locate the original file in the Finder, or to stop using the alias and add a copy of the file to the OmniGraffle document. Next to the pop-up menu is the path to the original file.
There are three options in the pop-up menu: choose Natural Size to keep the image as it is in the original file, choose Stretched to automatically scale the image to fit the object's bounds, or choose Tiled to repeat the image indefinitely across the surface of the object.
The Scale field applies only if you have chosen Natural Size or Tiled; enter a percentage to make the image larger or smaller.
The Offset fields apply only if you have chosen Natural Size; to move the image relative to the shape, enter values there or just drag the rectangle in the image well.
You can make the image transparent and let the object's fill show through by decreasing the value of the Opacity field.
Instead of creating an object then adding an image, you could also simply drag an image file from another application straight onto the canvas. A new shape object containing the image is created.