HOW TO: Determine if a document needs adjustment for OCR

// Set the threshold for how much gray to include in white/black regions
int threshold = 5;
// Run the stats command to determine minimum and maximum values
StatisticsInformationCommand statsCommand = new StatisticsInformationCommand();
statsCommand.Run(image);
// Use these values to select the "gray" region between the two endpoints
statsCommand.Start = statsCommand.Minimum + threshold;
statsCommand.End = statsCommand.Maximum - threshold;
statsCommand.Run(image);
// statsCommand.Percent should now return how much "gray" is in an image (not in the black or white regions)
Console.WriteLine("This image has {0:0.00}% of gray in it", statsCommand.Percent);

// If gray region is over 50%, perform image clean up
if (statsCommand.Percent > 50)
{
    Console.WriteLine("Performing image cleanup...");
    StretchIntensityCommand stretchIntensityCommand = new StretchIntensityCommand();
    ChangeContrastCommand changeContrastCommand = new ChangeContrastCommand();

    // Stretch intensity to make the darkest color black and lightest color white
    stretchIntensityCommand.Run(image);
    // Then increase the contrast to decrease the midtones
    changeContrastCommand.Contrast = 1000;
    changeContrastCommand.Run(image);
    Console.WriteLine("Done cleaup.");
}
else
{
    Console.WriteLine("Cleanup is not needed for this document");
}