The sample application offers 2 pre-processing options:

• Auto binarize - Automatically converts 8-bit and 24-bit images to a 1-bit image. Binarization cleans up an image in preparation for OCR.
• dot shading removal - Removes areas of shading from 1 bit images. Text within the shaded area will generally be preserved.

To apply these pre-processing options to the uploaded invoices, select them and then select Re-Run from the menu bar. Your invoices are processed again with the pre-processing options taken into consideration.

If you have loaded your invoice and realize that the pre-processing options were not set, there is no needs to reload the invoices again. Simply set the pre-processing options and select Re-Run on the menu. The already loaded invoices are processed again with the pre-processing options.