16.0

Preprocessing Images 37
Hue / Saturation / Lightness - click this tool then use the
sliders to modify the hue, saturation and lightness of your
primary image.
Crop - if you decide to use only a given part of your image,
click the Crop tool then select the area to keep and the rest of
the image will be removed.
Rotate - click this tool to rotate (by 90, 180 or 270 degrees)
and/or flip your image, or its selected area.
Despeckle - click this tool to remove stray dots from your
image. Despeckle works on the OCR image at 4 levels. You
can also use this tool not to remove noise from the page but to
strengthen letter outlines: to do this mark the checkbox
Inverse despeckling.
OCR Brightness - use this tool the set Brightness and
Contrast of your OCR image. See the diagram showing
optimum brightness under Preprocessing Images above.
Dropout color - click this tool and pick a color. Sections of
the scanned image in this color will be set transparent. The
tool has its effect on the OCR image.
Resolution - use this tool to decrease the resolution of your
primary image in percentages. Note that you cannot adjust a
resolution higher than that of the original one.
Deskew - sometimes pages are scanned crookedly. To
straighten the lines of text manually, use the Deskew tool.
(Auto-deskew is also available in the Process panel of
Options.)
3D Deskew - use this tool to remove perspective distortion
from digital camera images. This is particularly useful when
you want to check the results of automatic 3D Deskew or you
prefer to do 3D deskew manually after a Load Files step.