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+1  Q: 

Have UITouch only perform task when touching certain color

How can I have UITouch recognize and perform a certain task ONLY when I touch a certain color in a UIImage view.

For example:

I have an image of a street. The street has greyish buildings and a white road. If I touch a building, I don't want anything to happen, but if I touch a white road, I want to highlight that section where I touched to a light blue.

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