Boost specific colours
Click on the HSL/Color/B&W panel and click on HSL – this stands for Hue, Saturation and Luminance. This panel lets you make blues more blue, reds darker or change your colours completely. For this picture, we clicked on Saturation and dragged the Blue slider to +48. We also increased the Luminance on the Blue channel to really brighten the sky. Remember this panel when you want to tweak individual colours within your image.