Color Correction Training
Color correction can seem mysterious to a beginner, but it's a systematic method taking the values of certain pixels (RGB, brightness, saturation) and changing them into other values. Two correction methods are most often used, but the variety of methods and the software used to implement them are too numerous to explain fully in one article.
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White and Black Color Sampling
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Most programs have an automatic correction process that uses sampled parts of an image. This is done by using a tool (usually an eyedropper within the color correction utility) to tell the program which part of an image "should" be solid white. The same process is used to identify a solid black part. Then the program will change those colors accordingly and stretch the adjustment over the entire color scheme.
RGB Levels
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Another method of correction is to adjust the values of the red, green and blue channels independently. Displays produce every color by combing these three colors in differing amounts. To correct an image, you simply need to add or subtract channel values. For example, an image that is too yellow can be corrected in one of two ways: by decreasing the amount of red and green, which create yellow in an RGB color space, or by adding more blue, which cancels out yellow.
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Further Research
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For specific insight into your situation, searching the Internet will result in many free resources. Sites offer tutorials on the different methods of correct for a specific program, one of which may meet your needs.
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References
Resources
- Photo Credit RGB image by wally from Fotolia.com
