The most practical home scanners used to be handle-held devices that the user could slowly track across the desired image, strip by strip.

最实用的家庭扫描仪过去是手动的，使用者可以一条一条地扫描想要的图像。

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British graphic novel artist David Lloyd is the man who created the original image of the mask for a comic strip written by Alan Moore.

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The key difference is that instead of focusing the light on a strip of photochemical film as in traditional cameras, digital cameras use an image sensor, called a charge coupled device (CCD), to capture the image.

FORBES: Technology briefing