6-4
iVina 1200U
Halftone
In addition to the black and white display, Halftone simulates gray scale by using different size of dots.
Particularly when you view the image at a certain distance, it looks very closely like a gray image yet it
consumes the least disk space. Halftone is the picture that we usually see in newspapers or magazines.
Since Halftone is one type of black and white image, the disk space required to save a halftone image is
1/24 of that required to save a 24-bit true color image.
Figure 6-6 Halftone Image
Gray (4096 levels gray scale/Internally)
Usually, a single-channel image consists of at least 8-bit or 256 levels of shades of gray in an image.
However, AV620CS Plus with 12 bits produces a Gray image with 4096 shades of gray between pure
black and pure white. Gray is the best choice of image if you wish to scan a black and white photograph.
With 12 bits of color information per pixel, the disk space required to save a gray image is eight times
more than lineArt and 1/3 of that required to save a 24-bit true color image.
Figure 6-7 Gray Image
256 Colors
The 256 colors image provides 256 levels of color hues. The disk space required to save an image in 256
colors is 1/3 of that required to save a 24-bit true color image.
Figure 6-8 256-Color Image
