This is the original color image. The camera is a Canon Powershot A300.

This variation shows what can be done with layer masks in the GIMP. To create this effect, I copied the original image into a separate layer and removed the red panic button using a layer mask. Then it was simple enough to invert the mask in yet another layer to isolate the panic button from everything else. I desaturated the layer excluding the panic button and increased the saturation in the layer that isolated the panic button.

Continuing from the previous image this one I increased the contrast and brightness of just the panic button excluded layer.