The best results in image restoration rely upon being able to determine a high S/N PSF from the same frame. Current PSF modeling code provides acceptable PSFs when high quality empirical PSFs are not available. PSFs from the WFPC PSF Library are about of equal value as model PSFs. Their use is limited owing to non-optimum exposures and time variability of focus. Improved modeling of the HST optical system (e.g., Redding 1994) should allow for better results in image restoration using model PSFs. In order to achieve accurate restorations of data with high dynamic range excellent PSF models are required. PSF models are less critical when the intrinsic source structure is smooth compared to the size of the PSF.
Acknowledgments
This work has been supported by ST ScI's Image Restoration Project.