This is an art rather than a science. Not least in deciding whether or not it's necessary!
Original image (scaled)
Here's a picture of some impala taken in Zambia (July 2001; Canon AE1 SLR camera, 210mm lens, scanned from a print). It was early morning, and the light is very washed out, and I'm not the world's best photographer. There's also a distinct yellow-green colour cast. All can be corrected, but of course you may prefer the original, which does have a certain atmosphere.
Remember to hold down the Alt key
Here's the result. As a further adjustment, I boosted the contrast slightly (Image processing:Gamma:Increase contrast). If you like, try some slight sharpening.
Stretched, colour-balanced, contrast-enhanced and sharpened
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