(ORG-4987)
Origin 9.1 have added Anti-aliasing support for 2D graphs. This allows nicer view of 2D graphs on the monitor.
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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Global control
We support anti-aliasing for plots, axes and grid lines, and line objects. User can enable/disable each on Graph tab of Tools: Options dialog.
Turn Anti-Aliasing On
By default anti-aliasing isn't turned on for 2D graphs since it may slow some operations down, such as zooming, panning, etc. For those enabled on Tools: Options dialog, user can click 
button on Graphs toolbar to turn it on for the active graph.