3.1.2. Demonstration

Demo

1. Open lena.png.
2. Show its histogram ( <Image> → Dialogs → Histogram )
3. Keep the histogram window open.
4. Access the Brightness and Contrast dialog ( <Image> → Layer → Colors → "Brightness-Contrast..." )
5. Modify the Brightness and Contrast in some way.
   
   Note: the entire modified image is displayed in real-time because Brightness and Contrast changes are so easy to calculate.
6. See how it affects the histogram.