In the current layer, perform "edit"-"free transform", or use the PS Free transform shortcut key ctrl+t, there will be a transform control bounding box around.
When we use the PS Free transform shortcut key ctrl+t, open the free transform, then with CTRL, Shift, ALT, you can zoom, rotate, perspective, and so on. Where the CTRL key controls the free change; Shift control direction, angle and equal proportions to zoom in and out; The ALT key controls the center symmetry. The details are as follows:
PS Free transform shortcut keys--alt
Press the ATL key, and then use the left mouse button to press and hold the corner of the deformation box, diagonal invariant center symmetrical free rectangle (can be reversed drag to form a rollover effect).
Press the ATL key, then use the left mouse button to press and hold the edge of the deformation box, the edge of the constant equal height or equal width of the free rectangle.
PS Free transform shortcut keys--ctrl
Press the CTRL key, and press the left mouse button to hold the corner of the deformation box, diagonally the free quadrilateral.
Press the CTRL key, and press the left mouse button to hold the edge of the deformation box, the free parallelogram to the edge.
PS Free transform shortcut keys--shift
Hold down the SHIFT key, with the left mouse button down the corner of the deformation box, such as Zoom in or out (can be reversed drag to form a flip figure).
Press the SHIFT key and drag outside the transform box with the left mouse button to rotate the angle by 15° increment.
PS Free transform shortcut keys--ctrl+shift
Press the Ctrl+shift key, with the left mouse button to press and hold the corner of the deformation box, diagonally angled trapezoid.
Press the Ctrl+shift key, in the left mouse button to press and hold the edge of the deformation box, to the edge unchanged equal height or equal width of the free parallelogram.
PS Free transform shortcut keys--ctrl+alt
Press the Ctrl+alt key, in the left mouse button press and hold the corner of the deformation box, adjacent to the position of the two corners of the central symmetrical free parallelogram.
Press the Ctrl+alt key, in the left mouse button press and hold the edge of the deformation box, adjacent to the position of the center symmetrical free parallelogram.
PS Free transform shortcut keys--shift+alt
Press the Shift+alt key, in the left mouse button to hold the corner of the deformation box, center symmetrical proportional magnification or narrowing of the rectangle.
PS Free transform shortcut keys--ctrl+shift+alt
Press the Ctrl+shift+alt key, in the left mouse button press and hold the corner of the deformation box, isosceles trapezoid, triangle or relative isosceles.