然而，CCD采集的图像都具有拖影。

However, the CCD acquisition images had smear.

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在打稿和印刷中，用来检查网点增大，拖影，重影等情况。

It is used in proofing and printing to check the condition of dot gain, slur and double.

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拖影在图像中一定会存在，因为它是探测器正常运作的结果。

It is inherent in the images because it is a result of normal operation of the device.

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