Autotek autocad raster design 2010 ユーザーズマニュアル

14 Click Close to exit the Histogram dialog box.

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)

Convolve uses 

 (page 398) and 

 (page 396) to

improve the appearance of grayscale images.

Smoothing filters reduce harshness and noise in your image. Sharpening filters
make differences in shading more distinct.

You can use the 

 (page 398) to reduce the harshness and visual

 (page 393) in a grayscale image.

If an image contains small details that are noise rather than useful data, you
can use the smoothing filters to remove these details. For example, a smoothing
filter can improve the appearance of scans of half-toned originals.

There are two types of smoothing filters, Low Pass and Median. For more
information, see 

 (page 108) and 

 (page 106).

 (page 396) to speed up the editing

commands.

Convolving an Image | 105