This basic image adjuster program uses the ColorMatrix Class of the System.Drawing.Imaging namespace to modify the brightness and contrast of a image.  It also uses the same class to convert a image to gray scale, sepia, or to a negative.  Examples of doing all 5 operations along with tracking if the image has been changed and if a file was dragged and dropped onto the picture box control are available along with all code being fully commented.

Download the VB.Net 2008 SP1 source code: code-imageadjuster.zip

Screen shot:

(Image in this screen shot was taken from www.digitalblasphemy.com)

This source is released under the GPL.