当自动转变的时候，转换比例可能更低。
The rates could become lower by the time the automatic conversion is made.
计算了图像比例尺，方便的将数字图像尺寸转换为实际尺寸；
Design the image scale, convenient of convert the numerical image size as actual size.
计算了图像比例尺，方便的将数字图像尺寸转换为实际尺寸；
Design the image scale, convenient of convert the numerical image size as actual size.
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