  Based on a large sample of disk and halo giant stars, for which accurate
effective temperatures derived through the InfraRed Flux Method (IRFM) exist, a
calibration of the temperature scale in the Vilnius, Geneva, RI(C) and DDO
photometric systems is performed. We provide calibration formulae for the
metallicity dependent T_eff vs color relations as well as grids of intrinsic
colors and compare them with other calibrations. Photometry, atmospheric
parameters and reddening corrections for the stars of the sample have been
updated with respect to the original sources in order to reduce the dispersion
of the fits. Application of our results to Arcturus leads to an effective
temperature in excellent agreement with the value derived from its angular
diameter and integrated flux. The effects of gravity on these T_eff vs color
relations are also explored by taking into account our previous results for
dwarf stars.
