Not all options in the Image Type dialog box are available with all scanners, image types, or Pixel Depth settings. See page 3-11for more information on when the Pixel Depth settings are available. The table below describes the Image Type advanced options.

Image Type advanced options

Category

Option

Function

 

 

 

Pixel Depth

Black & White

Uses a data format of 1 bit/pixel to

 

 

produce black and white images

 

 

 

 

16 Gray

Uses a data format of 4 bits/pixel to

 

 

produce 16 shades of gray

 

 

 

 

256 Gray

Uses a data format of 8 bits/pixel to

 

 

produce 256 shades of gray

 

 

 

 

8 Color

Uses a data format of 1 bit/pixel/color to

 

 

produce images in 8 colors

 

 

 

 

256 Color

Uses a data format of 8 bits/pixel/color to

 

 

produce images in 256 colors

 

 

 

 

16 Million Colors

Uses a data format of 8 bits/pixel/color to

 

 

produce images in 16 million colors

 

 

 

Halftone*

None

Determines tones based on data format

 

 

 

 

Mode A

Converts image into a hard tone to

 

 

produce a distinct image (1 and

 

 

2 bits/pixel/color)

 

 

 

 

Mode B

Converts image into a softer tone; most

 

 

suited for images containing large areas

 

 

of similar tones (1 bit/pixel/color)

 

 

 

 

Mode C

Represents images in the same way as

 

 

the net screen commonly used for

 

 

newspaper photographs

 

 

(1 bit/pixel/color)

 

 

 

 

Dither A

Expresses halftone in a 4 × 4 bayer dither

 

 

pattern

 

 

 

 

Dither B

Expresses halftone in a 4 × 4 spiral pattern

 

 

 

 

Dither C

Expresses halftone in a 4 × 4 net screen

 

 

dither pattern

 

 

 

 

Dither D

Expresses halftone in 8 × 8 net screen

 

 

dither pattern

 

 

 

Capturing Images From Within Applications 3-9