  We present BUDDA (BUlge/Disk Decomposition Analysis), a new code devoted to
perform a two-dimensional bulge/disk decomposition directly from the images of
galaxies. The bulge component is fitted with a generalized Sersic profile
whereas disks have an exponential profile. No other components are included.
Bars and other sub-structures, like lenses, rings, inner bars and inner disks,
are studied with the residual images obtained through the subtraction of bulges
and disks from the original images. This means that a detailed structural
analysis of galaxies may be performed with a small number of parameters, and
sub-structures may be directly studied with no a priori assumptions. To
illustrate its usefulness, we present the results obtained with a sample of 51
mostly early-type galaxies (but covering the whole Hubble sequence). These
results show some of the applications in which the code may be used: the
determination of parameters for Fundamental Plane and structural studies,
quantitative morphological classification of galaxies and identification and
study of hidden sub-structures. We have determined the structural parameters of
the galaxies in our sample and found many examples of hidden inner disks in
ellipticals, secondary bars, nuclear rings and dust lanes in lenticulars and
spirals, and also wrong morphological classification cases.
