Autotek autocad raster design 2010 Benutzerhandbuch

is especially useful for synthetic images with areas of nearly-uniform color.
A scanned USGS map, for instance, can be matched to an imported web-safe
palette.

■

Dither is similar to Match because the current indexed colors are usually
re-mapped to the closest colors in the imported palette. Unlike matching,
however, dithering attempts to reduce color banding by using groups of
pixels displaying the target colors. The combination of these colors is
perceived as a single color. Because dithering sacrifices spatial resolution
in order to match the appearance of the original color, the dither option
is best suited for continuous tone images such as photographs.

NOTE Unlike many other actions in the Palette Manager, importing a palette
effects the image without clicking the Apply button. To restore the image palette,
you should exit the Palette Manager and use the AutoCAD UNDO command.

1 Click Image menu  ➤  Image Processing  ➤  Palette Manager.

 (page 348) dialog box is displayed.

2 To display the 

 (page 337) dialog box, click Palette

menu ➤ Import.

NOTE Grayscale images must be converted to color before you can import
a palette. For more information, see 

 (page 130)

3 Navigate to the folder where the palette is located using one of the

following methods:

■

Choose the drive and folder using standard Windows navigation
procedures.

■

Choose a location from the Places List on the left side of the dialog
box to navigate directly to the My Documents folder (or the Personal
folder, depending on which operating system you are using), the
Desktop, or the Favorites folder.

■

In the Files Of Type box, choose the file format of the palette you
want to import.

NOTE If more than one kind of file with the same name is present in the
folder, do not enter in a filename with no extension.

126 | Chapter 6   Modifying Images