Digital Photography and Using Levels

Digital Photography is a really pain sometimes.  There are so many variables that we have to consider when working on digital files.  Monitor calibration, printer calibration.  What looks good on our monitor may be nat actually correct, it made over or under exposed, the colors may Look bad on our monitor, but they are actually correct.  What we can control however is how bright or dark the image is and we can do that by using levels.  I discuss using levels that is not dependent on monitor calibration or expensive calibrating equipment.