Use anti-aliasing. Aliasing is the undesirable effect produced when graphics and type are displayed on a monitor at a low resolution.
This can result in poor quality output for lower resolution devices (although techniques such as anti-aliasing may help mitigate this), but provides a fixed layout, allowing easy user visualisation. This is the method used by Adobe Acrobat.
While modern computers can eliminate this problem using anti-aliasing, earlier computer graphics did not support enough colors or possess enough CPU power to accomplish this.
turn off your original image layer and any other layer that sticks out beyond the site extent, and export an image. The tutrorial dataset has an example -- groundcover.tif.
To avoid having halos around your shapes, be sure to uncheck anti-aliasing ...
 See also: Alias, Aliasing, Window, Rendering, Origin
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