那這跟 overscan 有關係嗎?

Overscan
Most television sets magnify the image a little too much, cutting off a little from all four sides. Some cut off as much as 20% of the total image. Trained television technicians can usually fix overscan.


Overscan (自己翻的, 詞不達意請見諒)
大部分的電視稍微放大了影像, 四邊都被剪了一點. 有些甚至到整個畫面的 20% 之多. 受過訓練的電視技術師通常能修正此問題.

來源資料: http://gregl.net/videophile/anamorphic.htm