About Image Processing

Image processing involves adjusting the tones, halftone screens, sharpness, brightness and contrast of the scanned image to get a pleasing output image.

Black and white images (also called binary images) are composed of black or white pixels. There are no gray values in the stored image. Any appearance of shading or tones in a black and white image is achieved by varying the concentration of white and black dots (halftoning) on the page.

To get a good quality black and white scan of a continuous tone (photograph) or halftone (photo in a book, newspaper, or magazine) original requires the following types of image processing:

• Removal of halftone screens
• Suppression of moiré patterns
• Sharpening of edges in the image
• Lightening or darkening of highlights, midtones and shadows to get good contrast and detail
• Application of new halftone screens to photos and halftones
• Detection and suppression of colored and shaded backgrounds

The key to getting satisfactory scans or copies from your Xerox Nuvera from certain types of originals is understanding how to adjust the image processing controls and which controls to adjust. Follow the links at the left to learn more about image quality adjustments.

For help with solving specific image quality problems, see Solving Image Quality Problems.

TIP: If you copy/scan a great number of the same type of original documents, you can set custom image quality defaults. For example, if the majority of your copying/scanning is of dark photographic content, the system defaults can be set to accomodate this, saving you job programming time. To set up your system defaults to match your original input, contact your System Administrator.