I am using the framemarker PNGs on a white background. So the black outline is visible as well as the black 'pixels'. I notice that the PNGs also contain white 'pixels' which only become visible when overlaid on a coloured background.
As I'm using a white background, the white 'pixels' are not visible to the camera. Yet my app seems to work.
So what is the function of the white pixels? Would tracking improve if I overlay on a colour and both the white and black pixels are visible? Or can I only address a subset of the 512 markers if I only rely on black pixels?
Any enlightenment greatly appreciated.