User Guide

9 If you selected sub-region in step 6, and if the sub-region is associated

with an 8-bit color image, select a palette option from the drop-down

list:

■ Retain Current Palette applies your changes to the sub-region by

mapping to the closest colors from the current palette. This option

maintains the current palette and will not affect pixels outside the

selected region.

■ Rebuild Palette With All Colors creates a new palette to best

accommodate all colors in the entire image. Because this image

changes the palette, pixels inside and outside the sub-region may be

affected by this option.

■ Rebuild Palette With New Colors also creates a new palette, but this

option guarantees that colors in the sub-region are included in the

palette by giving preference to those pixels over pixels outside the

sub-region. Because this image changes the palette, pixels outside the

sub-region may be affected by this option.

10 Click Close to exit the Histogram dialog box.

If you are not satisfied with the results, you can use the AutoCAD UNDO

command to restore the image to the original settings.

NOTE You can reset the brightness and contrast to zero for all color channels by

clicking Reset Controls. This does not undo any edits you have already applied to

the image.

Quick Reference

Image ➤ Image Processing ➤ Histogram

Raster Design Toolbar

Command Line

ihistogram

Dialog Box

Histogram Dialog Box (page 316)

Adjusting Images with the Histogram | 95