Autotek autocad raster design 2010 用户手册
4 Select an image resampling method.
5 Click OK to change image density.
Quick Reference
Menu
Image ➤ Image Processing ➤ Change Density
Raster Design Toolbar
Command Line
idensity
Dialog Box
(page 303)
Setting the Color Depth for an Image
You can alter the color depth of an image.
Each pixel in a raster image stores color information. The amount of
information within each pixel is called depth and is measured in bits. Pixels
with more depth can store more information and therefore display more
colors. For instance, an 8-bit pixel can display one of 256 indexed colors (or,
in the case of grayscale images, shades of gray), while a 24-bit pixel can display
one of 16.7 million colors.
information within each pixel is called depth and is measured in bits. Pixels
with more depth can store more information and therefore display more
colors. For instance, an 8-bit pixel can display one of 256 indexed colors (or,
in the case of grayscale images, shades of gray), while a 24-bit pixel can display
one of 16.7 million colors.
The following table shows the color depths supported by Raster Design and
the number of colors each depth can display.
the number of colors each depth can display.
Available Color(s)
Color Depth
Type of Image
1 color
1-Bit
Bitonal
256 shades of gray
8-Bit
Grayscale
256 colors
8-Bit
Indexed Color
16.7 million colors
24-Bit
True Color
116 | Chapter 6 Modifying Images