A video switcher (10) advantageously affords the capability of executing avideo effect following recall that avoids visible artifacts upon transitioningfrom one effect to another. At the outset, the switcher identifies activeelements within the video effect, the comprising those elements that undergo achange during execution of the video effect, as opposed to those that remaininert during effect execution. The switcher then dynamically calculates offsetfor application to an initial key frame value for the video effect to avoidany change in value to active elements upon initial effect recall. The offsetvalue is applied to each subsequent interpolation of the video effect, therebycreating the desired result of applying only relative changes to the activeelements of the video effect.
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