If you want to darken the sky in a photo, there are a few different ways to do it. One way is to use the Levels tool in Photoshop. To do this, first make sure that the photo is in RGB mode. Then, click on the Levels icon (it looks like a histogram) and drag the black slider all the way to the left. This will darken the entire sky in your photo. Another way to darken the sky is to use a filter. There are several filters that can do this, including Darken and Lighten. To use these filters, first make sure that your photo is in grayscale mode. Then, click on the Filter icon (it looks like a funnel) and select Darken or Lighten from the list of options. ..