Back in the day, people didn’t have software programs that could “auto adjust” or “auto correct” your images. You had to learn the tools and do it yourself. Today, a lot of programs can correct your image’s white balance, contrast, and toning just with one click. As a result, when we’re put in the situation of needing to correct an image manually, We don’t know where to start. In this tutorial, I’m going to show you how to use Pixelmator to edit your image’s color and toning using two adjustments called Levels and Curves. Both these utilize the Image Histogram. The Histogram shows the number of pixels within the image at a given brightness. In other words, it sorts all the pixels in the image based on their brightness. The Levels and Curves adjustments manipulate this histogram.