Artifacts(1): alias and chromatic aberration

SChromatic aberration/distortion
Chromatic aberration occurs along boundaries that separate dark and bright parts of the image.
  • Reason: the lens fails to focus all colors to the same convergence point.
  • avoid: It can be reduced by inrceasing the focal length of the lens.
Spatial alias
 an effect that causes different signals to become indistinguishable, which can occur in sampling or reconstruction process. If the image data is not properly processed, the reconstructed image will differ from the original image. Usually introduced when representing a high-resolution image at a lower resolution.
Spatial anti-aliasing
Remove higher signal components which can’t be handled properly before sampling at a lower resolution.
Anti aliasing makes polygon edges not jaggy but smoothed out. The level of anti-aliasing determines how smooth polygon edges are.

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