Touch Gestures have been enabled in the 2014 release of Photoshop CC for Windows 8 systems. Touch input is recognized from any touch-capable device attached to the system, including opaque finger pads and indirect tablets as well as direct-touch devices integrated directly with a display. You can control Photoshop using devices which support two or more simultaneous touch points.
In Photoshop, two-fingered touch gestures are used to control the location, rotation, and scaling of the image canvas view. Users may alternate between touch view control and other interactions using the mouse or stylus, but touch may not be used simultaneously with other input. Touch control of the view is very convenient when painting on large monitors which are difficult to rotate physically and on tablets to avoid constantly shifting the device.