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Chapter 3 Processing documents 39
3D Deskew works by snapping the distorted image to a grid. All you need to do is to manually
straighten this grid, and image coordinates will follow - see illustration below (before - after
3D Deskew).
Fill - use this tool to apply a color to the image or a selected part of it. PO. AR.
Auto-crop - automatically detects margin areas on the page and reduces this to a
minimum. This is a way of unifying the margins on a set of pages with different sized
text areas. P+O. WH > AR
Clean borders - removes scanning shadows, spots and marginal notes from page edges
P+O. WH but relates only to the border area.
Punch-hole remover - replaces punch holes with the background page color. P+O. WH
but relates only to the border area.
Enhance whiteboard photo - Provides a slider control to let you improve the
readability of text and diagrams on whiteboards or blackboards, when captured by
digital camera. The following pictures show the possible difference when using this tool
along with the 3D Deskew tool.
Here is a typical digital photo of a white board, taken from the side with low contrast: