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Quickly varying lighting can cause problems for tracking, especially supervised tracking. You can reduce the lighting variations by hi-pass filtering the image with the Hi-Pass setting. The image will turn into a fairly monotonous gray version (consider using only the Luma channel to save memory). The Hi-Pass setting is also a Gaussian
filter size, but it is generally much larger than a 2-pixel blur to compensate for grain, say around 10 pixels. The larger the value, the more the original image will “show through,” which is not necessarily the objective, and the longer it will take to process.
You can increase the hi-pass image contrast using the Color settings, for example low=0.25, high=0.75.
You can use a small blur for grain/compression in conjunction with the high-pass filtering. It will also reduce any slight banding if you have used the Color to expand the range.
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