(ORG-4987)
Origin 9.1 has added Anti-aliasing support for 2D graphs has been added. This allows for nicer view of 2D graphs on the monitor.With Graph window active, click AA button on Graphs toolbar to toggle Anti-aliasing on or off for the graph.
The controls are available in the Graph tab of the Options dialog:
The images below show screen capture of a 2D line plot with and without anti-aliasing (click to pop up larger image):
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Turn Anti-Aliasing On
You can toggle Anti-Aliasing on and off using the 
button on Graphs toolbar for the active graph.
2D graph templates shipped with Origin have anti-aliasing turned off, since it may slow some operations down, such as zooming, panning, etc.
Additional Anti-Aliasing Settings
(ORG-6500)
For the graphs that has Anti-Aliasing turned on, there are additional global settings to fine tune which type of drawing to use anti-aliasing. These can be found on Graph tab of Tools: Options dialog.
