光栅图像格式将图片存储为描述像素状态的位图，而不是记录图元（譬如，线和曲线）的长度和位置。

Raster image formats store the picture as a bitmap describing the state of pixels, as opposed to recording the length and locations of primitives such as lines and curves.

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例如，对于长度是不是对一个有意义的标尺足够大的正数值，或者指定的文件是不是ImageMagick的有效图像文件类型，我们没有进行验证。

For example, we do not validate that length is a positive number big enough for a meaningful ruler or that the file specified is a valid image file type for ImageMagick.

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通过Phannie核磁共振仪的扫描，用户可以评估长度和体积的图像精度、可信度和分析结果；

By making MRI scans of Phannie, users can evaluate the image contrast, resolution and accuracy of distance and volume measurements.

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