This article explains how to correct colors in Photoshop. Instructions apply to Photoshop Creative Cloud 2014.

All camera lenses, regardless of price, distort images. Photoshop recognizes this and helps you remove this distortion.

To change the camera or lens, double-click the filter to open the Lens Correction dialog box.

Select Filter > Camera Raw Filter. This will open a fairly comprehensive window. At the top are tools that let you zoom in on the image, set the white balance, add a graduated filter, and more.