In this case, you place the image face-down on the bed, close the lid, and start scanning. Sheetfed scanners have an input slot into which you feed the document to be scanned. The scanner senses when something is being fed in and will start scanning. These scanners tend to be smaller than flatbeds but their prices are in the same range. Some models come with feeder trays that let you scan multiple documents.
Drum scanners have high price tags and provide very high-quality output.
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