If you want to create a black vignette in Photoshop, there are a few things you need to know. First, make sure your image is in RGB mode. Second, use the Burn tool (or the Dodge tool if you want a darker vignette) to darken the edges of your image. Third, use the Gradient Tool to create a gradient from black to white. Finally, use the Opacity slider on the Layers panel to control how much of the original image shows through the vignette. ..