We deconvolved two pairs of HST Planetary Camera F555W and F785LP filter
images of the
globular cluster NGC 6352. The image scale is approximately 0.04
arcsec/pixel. We preprocessed the images applying the
A/D correction, bias and preflash subtraction, dark current and flat
field corrections. For both chips #7 and #8, three 300-second F555W
exposures and four 1000-second F785LP images were averaged
using the IRAF imcombine task with cosmic ray rejection to produce
separate
F555W and F785LP master frames for each chip.
These master frames were deconvolved with the
iterative/recursive algorithm invoked with 3 recursion levels and 2 iterations
at each level. Variation of the PSF across the images was accounted for by
dividing the approximately 750750 images into nine 300
300
overlapping sections and restoring
each section independently with a PSF generated by the Tiny TIM software
(Krist 1992) for the section center. The signal-to-noise
ratio of the fainter stars in the deconvolved images was much improved over
those in the originals. There were no artifacts in the images, and the residuals
produced by the slight mismatch between the actual PSF and the PSF used in the
restorations were smaller compared to the central stellar fluxes than the
diffuse halos in the original data. As shown below, these
residuals have only a minimal effect on photometry of the images.