Autotek autocad raster design 2010 用户手册
To make differences in shading more distinct for a selected image
1 Click Image menu ➤ Image Processing ➤ Convolve.
2 Select the image or images you want to filter,then press Enter.
3 Click Expand All to expand the filter list.
4 Select the sharpening filter you want to use. A description of the selected
filter is displayed in the
(page 324) dialog box.
5 Click Run Filter to filter the image(s).
See also:
■
(page 105)
Quick Reference
Menu
Image ➤ Image Processing ➤ Convolve, Smoothing Filters
Raster Design Toolbar
Command Line
iconvolve
Dialog Box
(page 324)
Lowpass Filtering
Lowpass filtering can lessen the severity of tone change by reducing
high-frequency detail in an image in areas where pixel intensities change
rapidly.
high-frequency detail in an image in areas where pixel intensities change
rapidly.
The result is a slightly blurred image.
108 | Chapter 6 Modifying Images