You probably would not think that shutter speed and imbalanced colors would affect stitching and matching points.
Matching points involves locating matching pixel locations between adjacent image pairs. Several years ago someone told me that the software does some sophisticated 'edge shape definition' to find matching points. Shutter speed would improve image edge sharpness. Also digital colors are only represented by numbers. If the pixel color is same or nearly the same color number it might help in determine point precision.
But then.. only the program author would know exactly how points are selected - not sure if they would tell us. AND I am only making an somewhat educated guess.
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