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When we discuss this type of PAR, we are considering the symmetry of the actual pixel. Consider the pixel as a square box or rectangle. If it is a symmetrical square box, then the PAR or Pixel Aspect Ratio is 1:1 and in this case SAR and PAR are the same thing. However, the pixel might be asymmetrical and be elongated, making SAR and PAR dissimulator. When we discuss this type of PAR, we are considering the symmetry of the actual pixel. Consider the pixel as a square box or rectangle. If it is a symmetrical square box, then the PAR or Pixel Aspect Ratio is 1:1 and in this case SAR and PAR are the same thing. However, the pixel might be asymmetrical and be elongated, making SAR and PAR dissimulator. Anamorphic video is video with rectangular or elongated pixels. Since they are not square, the SAR does not match the PAR. Correction requires altering the video by encoding with the introduction of duplicate pixels in some rows and not in others so that the result utilizes square pixels without doubling every pixel, thus correcting the failure or SAR to match PAR. Various algorithms are used to accomplish this with individual preference varying based on result.