How to filter objects by color?

Hi, To detect a black object in a cluttered scene I tried to follow [this tutorial](http://www.pyimagesearch.com/2014/10/20/finding-shapes-images-using-python-opencv/). Due to natural light the color of the object (e.g. black) is not uniform on the captured image and therefore it was not possible to filter it out using the method described in the tutorial mentioned above. Does anyone know what is the best way to detect objects by color in cluttered scene? Thanks!