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Process Image
The file could be process before save as PDF or identify text.
1. Selection
Select menu->select -> rectangle (or ellipse, polygon) selection or click button  to make rectangle, ellipse, polygon selection.
2. Delete Selection
Select menu->select -> delete selection or click button  to delete the selection.
3. Invert selection
Select menu->select ->Invert selection or click button  to select reverse field in the image.
4. image crop
Click button  to reserve the field be selected, and delete reverse field in the image.
5. rotate left or right
Select menu->image->rotate +-90 or click button  to rotate the image.
6.rotate freely
Select menu->image->rotate freely or click button to open the dialog of rotate, Your can change the yellow ball to rotate the image.
7. remove black edge
Select menu->image->remove black edge or click button  to delete the black edge of the image.
8. dark or bright
Select menu->image->dark (or bright) or click button  to change the brightness of image to dark or bright.
9. negative
Select menu->image->negative or click button  to reversal all colors in the images.
10. set image size
Select menu->image->set image size or click button  to change the size of image. If you want keep proportion, your must select "keep aspect ratio".
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