Today I am going to share how to correct White Balance issues in your pictures with a Levels adjustment in Photoshop Elements (applies to regular PS also). I am not going to explain what White Balance is, that is a whole other post, and until I get to it, here is a great one by Cambridge in Colour: Understanding White Balance.
To keep things really easy, I am using a picture of a can and the WB is a bit too warm, a common problem when shooting inside without a flash.
Step 1: Create a Levels Adjustment layer by clicking on the circle at the top (PSE 6 and 7) or bottom (PSE 8 ) of your Layers palette and choose Levels.
Step 2: Once the Levels dialogue box is open, click on the gray dropper.
Step 3: Go to your Info box. If you do not have your Info box out, go to Windows and choose Info. Once you have your Info box out, look at the top left section, where it says R: G: B: and has numbers beside those letters. Move around your image and find a gray area and try to get the RGB numbers to be very close, if not the same. Click on that spot when you find it. Tip: For pictures of people, try the whites of their eyes.
I found a close enough number set in the area I circled on the picture below.
I did another Levels adjustment layer, bumping in the black and white sliders and moving the gray slider to the left a bit. Here is the final image:
And, to better see what a big difference a click or two of your mouse can make, here is a side by side comparison.