Subject review: White balance techniques of digital image

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Due to un control environment during creating of the digital image make the resulting image have un real color cast, for that a white balance algorithm has been found to correct the unreal color cast create by non-canonical Lighting sources, In order to achieve satisfactory color of the digital image, a white balance required to adjust the image color either automatically or manually. for that researchers found an automatic and manual white balance algorithms, and even the Automatic white balance algorithm depending on analysis either low level features or high Level features, explaining An examples for Automatic white balance algorithm ( Gray World Algorithm and The white patch Algorithm ) and clarify each Algorithm suits different kind of Image.