When you click or drag an area in your image with the Bump tool, it moves the central areas away towards the edges of the brush, creating a bump in that part of your image. You can use Bump to make certain elements in an image larger and more prominent.
In the Tool Options pane, customize the Bump tool:
Brush Size: Drag the Brush Size slider to adjust the size of the Bump tool brush. Hold down thekey to extend the range of the Brush Size slider beyond 100%. You can also manually enter a value from 0% to 200%.
Strength: Drag the Strength slider to adjust the intensity of the bulging effect.
Tip: You can use theand keys on your keyboard to change the size of the Bump tool brush.
Click and hold down or drag an area of your image to bump it.
Show Original: Click the Show Original button or press+ on your keyboard to see what the image looked like before you bumped anything in it.
Click Reset to discard all the current changes made with the Bump tool.