For some reason the sky does not come out blue on my photos like for example in this one HERE. This was taken with a 3.2 megapixel digital camera. I also have the same problem when using my mobiles 1.3 megapixel camera. The problem only seems to crop up when i am shooting a photo with an object partly obscuring the sky, like tree branches etc... can anyone tell me why this happens, and the solution to the problem!

thanks!