(CLICK FOR FULL-RES)
As in Photoshop, the toolbar is on the left, layers live on the right, and commands and adjustment menus run across the top of the screen. Start by adjusting curves. Since the app offers no adjustment layers (for now, Photoshop Touch provides no method for nondestructive editing), click the plus sign in the layers panel, and choose Duplicate Layer from the menu of options. Then tap the Adjustments menu and choose Curves. Adjust the curve by tapping to add points and dragging the points up or down. Click Apply when you have finished.