In digital cameras, we all talk about settings like brightness, exposure, contrast and white balance very frequently. But still, if we are questioned about what all these settings actually mean and how are they different from each other, we may end up confusing ourselves. To bring to an end such of our confusions, we have histograms. They provide the simplest mechanism to make us understand, observe, differentiate and tune these settings. Now let us learn how we can get an idea of this picture’s brightness, exposure, contrast and white balance through such histogram.