影像为适应特定显示屏,通过屈伸、裁剪或matte等方法更改的原始宽高比。适用宽高比一般是1.33:1或1.78:1。1.33:1的适用宽高比古代历史VHS文件格式所用。而matte方法是指,例如从1.78画面屈伸至1.33画面时会有一些的损失部份,于面主题不一定在中央,所以必须要使用它来维持画面主题的方法。
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