|
To scan
|
In the Image Type list, click the following item:
|
|
Text documents |
Lineart
B/W |
|
Text documents or drawings |
Halftone B/W |
|
Uncolored images with shades of
gray (black and white photos) |
Gray 256 Scales |
|
Color images at lower color resolution
(drawings, figures, schemas) |
256 Colors |
|
Color images at higher color resolution
(color photos, posters, etc) |
True Color, RGB |
|
- True Color, RGB In this scan mode, your scanner captures
24 bits (8 bit per channel R, G and B) of color image information for
every dot (pixel) in the resulting scanned image. RGB simply stands for
Red-Green-Blue, a color model in which every color is composed of a
varying amount of the colors red, green, and blue. Therefore it is
possible to produce over 16 million colors using this mode.
If you choose True Color, RGB mode, you can get excellent color
details from your scanner, but it requires considerable disk space to
store the resulting file.
- 256 colors In this scan mode, your scanner will produce
images that contain only 256 colors. If a color in the original image
does not match one of these colors, the program chooses the closest one
or simulates the color using available colors. In the 256 colors mode, 8
bits are needed for every dot (pixel) in the resulting scanned image.
To store an image scanned using 256 Color mode, you will need approximately
1/3 of the space required to save a 24-bit True Color image.
- Gray 256 Scales In this scan mode, your
scanner will produce images that contain more than just black and white,
and include actual shades of gray. In a grayscale image, each pixel has
more bits of information encoded in it, allowing more shades to be
recorded and shown. To reproduce a photo-realistic 256 shades of gray, 8
bits are needed for every dot (pixel) in the resulting scanned image.
To store an image scanned using 256 Gray Scales mode, you will need
approximately 1/3 of the space required to save a 24-bit True Color
image.
- Halftone B/W In this scan mode, the
images you will get from the scanner are composed of a pattern of black
dots that fool the eye into seeing shades of gray. Examples of halftone
images are the pictures you see in a newspaper. These images usually
look very coarse. Because this image type uses only 1-bit for every dot
(pixel) (like B/W Document, lineart), the resulting file size is smaller
than gray scale or color.
- Lineart B/W In this scan mode, your
scanner will produce images in 1-bit Lineart, showing image details in
black and white only. Lineart is a good choice for printed text or
pen-and-ink drawings. To reproduce an image scanned using Lineart B/W
mode, only 1-bit of color information is required for each pixel. The
space required to store this image is only about 1/8 of that required to
save 8-bit Grayscale image.
|