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Rez Tab.
You can change the processing and storage formats or reduce image resolution here to save memory. Floating point format provides the most accuracy, but takes much more time and space. Float processing with Half or 16-bit storage is a reasonable alternative much of the time. Most tracking activities use 16 bit format internally; you may wish to use 8 or 16 bit while tracking for speed and to maximize storage, then switch to float or half format when you render undistorted or re-distorted images, if you have high-dynamic-range half or float input.
It may be worthwhile to use only one of the R, G, or B channels for tracking, or perhaps the basic luminance, as obtained using the Channel setting. (The Alpha channel can also be selected, mainly for a quick check of the alpha channel.)
If you think selecting a single channel might be a good idea, be sure to check them all. If you are tracking small colored trackers, especially on video, you will find they often aren’t very colorful. Rather than trying to increase the saturation, use a different channel. For example, with small green markers for face tracking, the red channel is probably the best choice. The blue channel is usually substantially noisier than red or green.
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