Autotek autocad raster design 2010 用户手册

If you are not satisfied with the results, then you can use the AutoCAD
UNDO command to restore the image to the original settings.

Menu

Image  ➤  Image Processing  ➤  Histogram

Raster Design Toolbar

Command Line

ihistogram

Dialog Box

 (page 316)

You can convert a color image to a grayscale image using the 

 (page

316) dialog box.

Converting a color image to an 8-bit grayscale image can reduce the image
file size. You can also use the 

 (page 398) or the 

 (page 396) to enhance the details of an image. These editing filters work

only on grayscale images.

 (page 396) to speed up the editing

commands.

1 Click Image menu  ➤  Image Processing  ➤  Histogram.

 (page 316) dialog box is displayed.

2 Select the Color to Grayscale tab.

A preview of the image is displayed. If you selected more than one image,
the histogram displays a composite of the images' values. You can view
each image by clicking its name in the list.

98 | Chapter 6   Modifying Images