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I have the same problem: poor quality when scanning to pdf and using the ADF. I have tried various scanning options and file formats (using Acrobate to transform other files into pdf's), but the fuzziness and ghost lines are still there. The suggestion by Kandor will not work, at least when using the ADF (HP 6390C). The problem still needs to be solved! 
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I have the same problem: poor quality when scanning to pdf and using the ADF. I have tried various scanning options and file formats (using Acrobate to transform other files into pdf's), but the fuzziness and ghost lines are still there. The suggestion by Kandor will not work, at least when using the ADF (HP 6390C). The problem still needs to be solved!

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The pdf file resulting from a scanned document with black text and white background has an inhomogeneous bluish hue rather than being white. The text is also indistinct or fuzzy rather than being sharp. Any suggestions for improving the image quality?
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The pdf file resulting from a scanned document with black text and white background has an inhomogeneous bluish hue rather than being white. The text is also indistinct or fuzzy rather than being sharp. Any suggestions for improving the image quality?

Poor quality text/image with pdf files.

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.