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Holds the image transformation tile-set specifications.

This structure holds two 3x3 matrices that can be used to perform the transformation from the image's intrinsic 2-D coordinate system to its pixel coordinates, where (0,0) corresponds to the pixel in the lower left-hand corner.

N.B. the last row of both matrices is not used - i.e. should be (0,0,1) - but it may be used in the future to allow for a final projective transformation.