User Guide

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.
NOTE The preview reflects the image as it was read from the disk. If you
have made any display-only adjustments to the image using the Image Adjust
color map or the AutoCAD IMAGEADJUST command, then those adjustments
are not displayed in the image preview. If you make adjustments to the image
using the Histogram, the adjustments made with IMAGEADJUST are no longer
applied to the image; instead the new settings are applied.
4 If you selected a color image, then choose a color channel from the RGB
box.
5 Do one of the following to manipulate the image:
■ To make the image lighter, drag the Brightness slider to the right.
■ To make the image darker, drag the Brightness slider to the left.
■ To increase the distinction between the light and dark, drag the
Contrast slider to the right.
■ To decrease the distinction between the light and dark, drag the
Contrast slider to the left.
6 To adjust the scale in the histogram window, move the slider up and
down. Moving the slider up increases the scale such that low frequency
values become more visible and the highest frequency values become
truncated by the top of the window.
7 Click Apply to change the color values in the image file and generate a
new histogram that reflects the changes.
NOTE After you click Apply and generate the new histogram, the Brightness
and Contrast sliders are reset to 0.
8 If you specified a sub-region in step 2, select an option from the Apply
Changes To section:
■ Sub-Region applies the changes to the sub-region only.
■ Entire Image applies the changes to the selected image.
94 | Chapter 6 Modifying Images