User Guide

If you are not satisfied with the results, then you can use the AutoCAD
UNDO command to restore the image to the original settings.
Quick Reference
Menu
Image ➤ Image Processing ➤ Histogram
Raster Design Toolbar
Command Line
ihistogram
Dialog Box
Histogram Dialog Box (page 316)
Converting a Color Image to Grayscale
You can convert a color image to a grayscale image using the Histogram (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 smoothing filters (page 398) or the sharpening
filters (page 396) to enhance the details of an image. These editing filters work
only on grayscale images.
Raster Design uses Single Image Optimization (page 396) to speed up the editing
commands.
To convert a selected color image to a grayscale image
1 Click Image menu ➤ Image Processing ➤ Histogram.
The 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