How do you only show certain colors in a picture?

Question: How do you only show certain colors in a picture!?

heres a picture of it:
http://files!.lunapic!.com/p/34851

i've been trying hard to know how to do this!.!.
all i know is you do it on lunapic!.comWww@QuestionHome@Com

Best Answer - Chosen by Asker:

Under adjust go to color spotting!. Unless your image is really clear and contrasting though, it doesn't work that well!. You'll have to play with it a lot more than that!.Www@QuestionHome@Com

Here is one way to do it!.

http://digital-photography!.suite101!.com/!.!.!.

Start with a color photo and in Photoshop or similar program such as the GIMP select the areas to stay colored, the magnetic lasso is agood tool!. Then desaturate (Take the color out) of the rest of the image!.Www@QuestionHome@Com

The only way I can see of doing this is in Adobe Photoshop!. That lunapic website seems like a load of rubbish!.Www@QuestionHome@Com