  We present surface photometry and metallicity measurements for 104 nearby
dwarf galaxies imaged with the Advanced Camera for Surveys and Wide Field and
Planetary Camera 2 aboard the Hubble Space Telescope.
  In addition, we carried out photometry for 26 galaxies of the sample and for
Sextans B on images of the Sloan Digital Sky Survey. Our sample comprises dwarf
spheroidal, irregular and transition type galaxies located within ~10 Mpc in
the field and in nearby groups: M81, Centaurus A, Sculptor, and Canes Venatici
I cloud. It is found that the early-type galaxies have on average higher
metallicity at a given luminosity in comparison to the late-type objects. Dwarf
galaxies with M_B > -12 -- -13 mag deviate toward larger scale lengths from the
scale length -- luminosity relation common for spiral galaxies, h \propto
L^{0.5}_B. The following correlations between fundamental parameters of the
galaxies are consistent with expectations if there is pronounced gas-loss
through galactic winds: 1) between the luminosity of early-type dwarf galaxies
and the mean metallicity of constituent red giant branch stars, Z ~ L^0.4, 2)
between mean surface brightness within the 25 mag/sq.arcsec isophote and the
corresponding absolute magnitude in the V and I bands, SB_25 ~ 0.3 M_25, and 3)
between the central surface brightness (or effective surface brightness) and
integrated absolute magnitude of galaxies in the V and I bands, SB_0 ~ 0.5 M_L,
SB_e ~ 0.5 M_e. The knowledge of basic photometric parameters for a large
sample of dwarf galaxies is essential for a better understanding of their
evolution.
