Tone curve is normally split into 3 areas, including Shadows, Mid-tones and Highlights. In Cut Paste Photos Pro, we use 5 points targeting a wider range of adjustment. The two top adjustment areas are for highlights, the middle dot is for the mid-tone, and the last two are for shadow adjustments. This curve can be linear, with ups and downs or constant. Here are some useful tips on how to use this curve for editing pictures on a mobile: