Abstract
We have developed COSMOPACK, a set of tools that transform images of real galaxies to depict their appearance at a given redshift as observed with a given telescope and camera. The transformation includes K-corrections, change of observing band, repixelation to the scale of the observing system, convolution by the seeing, and noise from sky, detector, and dark current. We show two applications of COSMOPACK: 1) the visibility of a number of galaxy types, and 2) the recovery of effective radii and effective surface brightness as a function of redshift in the COSMOS survey.
