Adjust grayscale to black and white conversion settings

When invoices are scanned in color or grayscale, Kofax ReadSoft Invoices converts the images to black and white for interpretation.

Kofax ReadSoft Invoices' default conversion is appropriate in most situations. However, if there are problems with interpretation, you can adjust the conversion settings. This affects the image that Kofax ReadSoft Invoices uses for interpretation, which in turn affects interpretation.

Note These settings cannot be adjusted on a Learned invoice definition.
  1. Using Optimize, select View > Image > Color image conversion. The Color conversion dialog is displayed.
  2. Adjust the display:

    images\Color_conversion_BW_display_button.gif Click this button to display the black and white representation of the invoices.

    images\Color_conversion_zoom_in_button.gif images\Color_conversion_zoom_out_button.gif Click these buttons to zoom the image, or press F3 and F4.

  3. To let Kofax ReadSoft Invoices adjust the conversion settings for this invoice, select Automatic (values shown for Enhance background, Enhance foreground, and Remove noise have no effect). Otherwise, skip to step 5.
  4. Select Ignore black border to remove a black border around the edge of the image, if applicable. (This option is enabled when Automatic is selected.)
  5. The background, foreground, and noise settings are based on a scale from 0-255, where 0 is pure black and 255 is pure white.

    Because you must begin with the foreground and background parameters, maximize Remove noise by changing it to 255. This ensures that all pixels with values between the foreground and background settings are eliminated (that is, turn white).

  6. Specify the background value. All shades of gray with a value higher than the one you specify are interpreted as background.
  7. Specify the foreground value. All shades of gray with a value lower than the one you specify are interpreted as foreground. As a rule of thumb, try to specify this value so that all of the printed information on the invoice is preserved.
  8. The noise removal parameter controls the interpretation of shades of gray with values between the background and foreground settings. This setting is normally between 15 and 45. The lower the setting, the more detail that is preserved.
  9. Fields with background raster may cause problems with interpretation.
  10. Click OK.
    Tip If this does not correct the interpretation problem, try using a color filter, or see Fine-tuning interpretation.