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| Tutorial: Correcting White Balance / Levels in Adobe Photoshop® by Brad Petersen
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Introduction
Clicking away at the family birthday or a ball game inside a gymnasium, then it hits you – you forgot to adjust the white balance to compensate for the lighting.
All is not lost, & with just a few clicks, you can restore the white balance as seen below:

Note: Though this was written using Photoshop many graphics editors will provide the same functionality!
Step 1
Open the image, and go to Image, Adjustments, Levels (PC: Ctrl-L):

Step 2
A histogram will pop-up on screen with 3 eyedroppers under the chart.
Black, Neutral and White. Click on the White eyedropper on the right as shown:

Step 3
Take the eyedropper and go click on a known, white spot/area in the image. You may want to even zoom in on the image (Ctrl +) and even look at your monitor at an extreme angle to really see the white areas. This will basically set the white point in the image:

Step 4
With the white point known and set, do the same for the black point, by now selecting the left eyedropper, and click on a known black point in the image:

Step 5
With your image now getting closer to proper white balance, now set the Neutral point by selecting the center eyedropper and again, go in the image, zoom if needed, to find a neutral gray area, similar to the background in the workspace as shown below:

Step 6
An alternate method of setting the neutral (gray) point as shown above, would be to select the small pointer under the histogram, and slide it left or right and adjust levels manually as shown below. This globally adjusts the image's basic levels/brightness too:

Step 7
With your image now looking more like what you remember and having the basic levels and white balance adjusted, further editing can be done per your normal workflow:

Levels adjustments are not a "one-size fits all". Don't be afraid to experiment to get a feel of what works and what doesn't. This method is often far more accurate than a one-click Auto-Levels adjustment, and as always, proper monitor calibration is very important.
(c) Copyright 2006, Brad Petersen & EyeFetch.com. All rights reserved.
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