CRT Display B
This setting is suitable for 256-color displays and other displays that are capable of showing multiple color levels. On these types of displays, scanned data appears dark and grainy. CRT Display B gamma correction processes the image data to appear more continuous, improving its display appearance. On identical computers, CRT Display B images appear brighter than CRT Display A images.
Printer Output A
This is the best choice for output on high-resolution printers (24-dot matrix and laser printers). This type of correction processes image data to appear more as individual dots, lightening the image. This type of processed image may appear light or washed out when shown on a computer display.
Printer Output B
Use this type of correction when printing out on low-resolution printers (9-dot matrix). This type of output device produces images that appear grainy; Printer Output B correction adjusts the data to appear more continuous. The resulting image may appear light or washed out on a computer screen. Also, Printer Output A images appear lighter than Printer Output B images when output on the same device.
Printer Output C
Use this type of processing when images and data are combined. If you use this type of correction, black characters in an image appear sharper, while illustrations are not affected.