The quality of a scanned image with Epson Scan is poor. What should I do?

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  Related references
  Back of Original Image Appears in Scanned Image
  Image Colors are Patchy at the Edges
  Image Consists of a Few Dots Only
  Image is Distorted or Blurry
  Image is Too Dark
  Line of Dots Appears in All Scanned Images
  Ripple Patterns Appear in an Image
  Scan Area is Not Adjustable in Thumbnail Preview
  Scanned Image Colors Do Not Match Original Colors
  Scanned Image Edges are Cropped
  Straight Lines in an Image Appear Crooked