SAR PAR DAR的区别

SAR PAR DAR的区别

图像是否保持原始比例的问题，维基解密讲的很清楚

 Display Aspect Ratio (DAR)

 Storage Aspect Ratio (SAR)

 Pixel  Aspect Ratio  (PAR)

关系：SAR × PAR = DAR

For example, a 640 × 480 VGA image has a SAR of 640/480 = 4:3, and if displayed on a 4:3 display (DAR = 4:3) has square pixels, hence a PAR of 1:1. By contrast, a 720 × 576 D-1 PAL image has a SAR of 720/576 = 5:4, but is displayed on a 4:3 display (DAR = 4:3).