Sub-Region applies the changes to the sub-region only.If you specified a sub-region in step 2, select an option from the Apply Changes To section:.Note: After you click Apply and generate the new histogram, the Brightness and Contrast sliders are reset to 0. Click Apply to change the color values in the image file and generate a new histogram that reflects the changes.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. To adjust the scale in the histogram window, move the slider up and down.To decrease the distinction between the light and dark, drag the Contrast slider to the left.To increase the distinction between the light and dark, drag the Contrast slider to the right.To make the image darker, drag the Brightness slider to the left.To make the image lighter, drag the Brightness slider to the right.Do one of the following to manipulate the image:.

If you selected a color image, then choose a color channel from the RGB box.

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.

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.

Note: The preview reflects the image as it was read from the disk.

Move brightness slider to top