Do you get frustrated with the colour balance of your images?
There is a quick way to automate colour correction using Curves.
From the top menu bar, click image, then adjustments, and then curves.
When the Curves dialogue window opens, click the options tab. Now click on the Find Dark a Light Colours. You also should tick the box that says, snap neutral midtones. You can save this whole process as a default if you tick the box at the bottom left hand corner. (save as default)
Now, when you use curves and click the OK tab, Photoshop will scan the image using threshold and find the dark (the black) the light (white) and snap the midtone shades by placing colour picker eyedroppers for you.
This process works for about 80% of images and you will achieve some great results. There will be times that this process is not as effective on certain images, and you will then need to do colour correction manually. However, this little tip will save you a great deal of time and will enhance your images greatly.