With an infusion of Snapseed image-editing technology, Google+ has built in a range of options for common photo adjustments and customizable filter effects. The Google+ tilt-shift tool lets you adjust the position and strength of the blurring effect as well as fiddle with contrast, brightness, and saturation. Google has kept a steady emphasis on improving photos for its social-network site, largely replacing the old Picasa Web Albums with Google+.
Control points are tied to a specific color, so you can for example click to place one in the blue sky, drag the size slider to make it fill the whole screen, then drag the brightness slider to darken only the sky.
The control points let you adjust specific regions of an image, for example increasing the brightness in this shadowy region. The green ring around the dot indicates that brightness has been increased. You can move, duplicate, and delete control points.