... We describe the CCD image data collected by the HST by using the model discussed in detail by Snyder, Hammoud, and White (1993) in which the data collected at pixel of the CCD detector, , is described as . ... where is the object's intensity function, is the flat-field response function, is the PSF, and is a collection of parameters that are determined by the optical path-length error (Goodman 1968) due to the spherical aberration, focusing error, or other aberrations. ...