Determines whether to apply entire-scene anti-aliasing.
If this property is set to true, then text, polygons and images
will be anti-aliased together instead of individually. This uses
considerably more memory and takes considerably longer but can
result in higher-quality output.
When this property is set to true, this implicitly disables any
other anti-aliasing applied to individual object types.
Anti-aliasing is a technique for using gradients of color to
eliminate jagged edges when objects are drawn.