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Some loss of sharpness is an unavoidable result of resampling an image when the sampling locations are not on pixel centers. When an image processing task has multiple steps, it is most natural to perform these steps sequentially with each step reading from the result of the previous step. Each subsequent image generation decreases the sharpness of the final result. The more generations, the more degraded the resulting image becomes. Better resampling methods can help to control this image degradation.