With today’s hectic lifestyles, we are all looking for ways to get more done in less time. When you are working in Photoshop and Photoshop Elements, you can multitask by making changes to several layers at one time.
Begin by holding the Ctrl key (Mac: Cmd key) as you select all of the layers you want to adjust. Next, hold the Ctrl and the Shift key (Mac: Cmd + Shift) as you click on the thumbnails of each of those layers in the Layers Palette.
Finally, select Layer > New Adjustment Layer and choose an adjustment like Black and White, Hue/Saturation, or Brightness/Contrast. When you make the adjustment, Photoshop and PSE will apply it to all of the selected layers … multitasking at its finest!