物理尺寸：一个图像的物理尺寸取决于两个因素：屏面上的图像尺寸大小和文件尺寸大小。
The physical size of an image is based upon two things: The size of the image on the screen and the file size.
这些尺寸的大小必须满足这样一个规则，尺寸的二倍必须小于或等于在那个方向上图像的尺寸大小。
These sizes must obey the rule that twice the size specified must be less than or equal to the dimension of the image in that direction.
他拍摄了几百张鲸鱼高清晰度照片，然后将一张张拼凑成一个原尺寸大小的图像。
He takes hundreds of high-resolution pictures of a whale and then put piece to piece together to create a life-sized image.
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