Click on the Use windowing mode button to select the view mode, or press the W key when the image is in focus.

There are 7 sub-modes in the view mode.  Press the W key when in this mode to switch between the sub-modes.

Each of the sub-modes will display the image using the selected color profile.

You can also adjust the window level/center and window width levels by using the mouse.  Hold down the mouse button and move the mouse up and down to increase/decrease the window level/center.  Hold down the mouse button and move the mouse left and right to increase/decrease the window width.