There is a lot of tutorials describing how to use the image editors to adjust the colors of your photos. Many editors and organizer including my favorite Windows Live Photogallery are able to do it with just one click. If you have the newest Adobe Photoshop CS4, I highly recommend to try its new function Vibrance Adjustment.
Photoshop
How to adjust photo colors using Adobe Photoshop CS4
How to give sketch effect using Photoshop CS2
Adobe Photoshop CS2, the most efficient photo-editing tool offers various artistic effects that can render your simple and typical photographs into dynamic and enhanced art works. One such effect is Sketch effect. In this peculiar style a photograph or an image or converted into a sketch. These kinds of effects are essential while preparing your tour portfolio or just remembrance album of your most memorable journey or anything that needs an artistic look. The only thing you need to bear in mind is that the image should be high contrast in itself to get the best looks. Also see that the background must not be too busy, the simpler the better.

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