Poor-quality documents with "noise" (i.e. random black dots or
speckles), blurred and uneven letters, or skewed lines and shifted
table borders may require specific scanning settings.
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Poor-quality documents are best scanned in grayscale. When scanning in grayscale, the program will select the optimal brightness value automatically.
Grayscale scanning mode retains more information about the letters in the scanned text to achieve better OCR results when recognizing documents of medium to poor quality. You can also correct some of the defects manually using the image editing tools available in the Image Editor.
For details, see Editing Images Manually.