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+[{{ paag_aliasing_and_antialiasing.png|a) imagined continuous source signal (yellow)\\ b) perceptual artifacts (white)\\ c) sample (gray)}}] **Aliasing** refers to perceptual distortions or artifacts which are caused by sampling errors when converting a continuous source signal, as seen by the eye, the camera or as imagined, into discrete values on a fixed digital raster.
+**Antialiasing** (AA) is an umbrella term for all techniques which aim to lessen the unwanted perceptual artifacts, e.g. by:
+  - lowering contrast
+  - averaging or inventing new sample values
+  - increasing resolution
+and others or combinations of these.
+(In the example image here, aliasing also shows within the imagined continuous source signal itself.)
+further reading:
+  * [[wp>Aliasing]]
+  * [[wp>Jaggies]]