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Charge-Coupled Device (CCD) detectors, widely used to obtain digital imaging,can be damaged by high energy radiation. Degraded images appear blurred,because of an effect known as Charge Transfer Inefficiency (CTI), which trailsbright objects as the image is read out. It is often possible to correct mostof the trailing during post-processing, by moving flux back to where itbelongs. We compare several popular algorithms for this: quantifying the effectof their physical assumptions and tradeoffs between speed and accuracy. Wecombine their best elements to construct a more accurate model of damaged CCDsin the Hubble Space Telescope's Advanced Camera for Surveys/Wide Field Channel,and update it using data up to early 2013. Our algorithm now corrects 98% ofCTI trailing in science exposures, a substantial improvement over previouswork. Further progress will be fundamentally limited by the presence of readnoise. Read noise is added after charge transfer so does not get trailed - butit is incorrectly untrailed during post-processing.

An improved model of Charge Transfer Inefficiency and correction algorithm for the Hubble Space Telescope