Many thanks, definitely worth trying.

Tom

They should, but it's worth testing, the difference may be marginal. You're likely to see improved detection times, but the tracking performance may be nearly equivalent.

Many thanks for your reply, David. So in short, am I right to understand that framemarkers on a medium grey background will result in better tracking than on a pure white background?

Tom

As you've noticed, the white blocks are redundant w/ the black blocks. This provides for more robust detection and tracking over a broader range of backgrounds. 

The SDK converts all images to grayscale for processing and so colors are not significant. It's the luminance contrast of the image that it used by the tracker. So the best way to analyze background colors for FrameMarkers is to convert them to grayscale and look for ones that are a medium gray between black and white - i.e. so both the white and black blocks stand out against the background.