Kodak I780 - Document Scanner, Product Information

January 2008 

19 

Fixed Thresholding 

Fixed thresholding is used for black and white and other high-contrast documents. A single level 

is set to determine the black and white transition. This threshold is programmable over the entire 

density range. When Contrast is set to zero, Threshold is fixed. When Contrast is set to 100, 

Threshold is fully dynamic. Usually a setting in between these numbers produces the best results. 

Fixed thresholding is used where the desired output is consistent vs. variable as with ATP. 

Testing should be performed to find the best fixed threshold level in these types of applications.

Fixed thresholding may not be used when adaptive thresholding or dithering is selected.

Perfect Page scanning — for Black and White, Grayscale and Color Images 

Perfect Page scanning means that within the scanner, images are correctly deskewed and 

straightened. Black borders have been accurately reduced, without clipping corners. Photographs 

look like photographs. Exposure and contrast have been optimized to bring out details. Lines and 

fonts appear with smooth edges. All this, in color or black and white, without operator intervention 

or post-processing. Only the combination of Kodak optics and image processing bring you Perfect 

Page scanning. 

Perfect Page scanning with iThresholding 

Perfect Page scanning with iThresholding delivers high-quality black and white images from a 

large range of both poor- and high-contrast documents and reduces the need to pre-sort, rescan, 

and perform post-image processing. You get better image and text legibility, smoother lines, 

minimal to no artifacts, and fewer shaded areas with minimal or no user intervention. 

Scan mixed batches of documents of varied contrast in background and/or text with the 

iThresholding features and the scanner dynamically evaluates each document in the batch to 

determine the optimal threshold value to produce the highest quality image. Brightness is 

automatically adjusted for each individual document for highlighting, low contrast, and lightweight 

paper. 

Perfect Page is a combination of built-in powerful imaging technologies. Every scan is optimized 

as it is captured. Perfect Page scanning also shifts gears automatically to handle a wide range of 

documents. 

Polarity 

Used to reverse the pixel values of a black and white image (i.e., make the white pixels black and 

black pixels white). Polarity may be used when a reverse document is scanned (common in old 

government records systems) or documents that do not appear readable in Normal mode may 

become legible using polarity.

Image Output 

The scanner outputs either compressed or uncompressed raw data to your application. The 

bundled drivers output JPEG and TIFF image formats. Use your application to select an image 

format in which to save the image data.