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by desaturizing the image or converting to B&W. Color saturation is often improved by adjusting the contrast first, however, colorization may not be improved by adjusting the contrast first. Post processing and adjusting the saturation is necessary.
Preprocessing is very tricky. The best results I've gotten are from just making the images a bit sharper and doing auto-contrast. But that will still cause problem sometimes depending on the image.
I understand. As I've put it, it's all about the information that's available in the photo itself. Silver stock, Kodachrome, and washed-out or dark images all impact how much information you have to process. If everything looks white, nothing can magically identify the color.
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