If you want to darken an image in Photoshop, there are a few different ways to do it. One way is to use the Levels tool. To do this, first make sure that the Image layer is selected and then click on the Levels button (it looks like a histogram). Next, drag the black slider all the way to the left until the image becomes completely black. You can also use the Black & White adjustment layer to achieve a similar effect. ..
