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Compositing packages frequently use lens correction models , ie the model describes how much the distorted image must be moved (corrected) to produce an ideal image: the error as a function of the position on the distorted image. Such models are fast in compositing, where computer generated images must be distorted, but not fast for match-moving.
The classic lens distortion values in SynthEyes describe a lens distortion model, ie they compute how much distortion is present at each location in the ideal image of the 3D scene. These are faster for match-moving, including being able to display 3-D meshes overlaid on the original imagery in the perspective view.
Nuke refers to these as forward and backward distortion models.
SynthEyes has some models available in both directions, such as Radial-4 and Anamorphic-6. The compositing-friendly models are referred to as “Standard” (eg Std. Radial-4) to reflect that being typical industry practice; the match-moving-friendly models have no special designation (eg just Radial-4).
The same coefficients cannot be used in both directions, but the solver can be used to convert them by locking everything else.
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