Color transformations calculator determines the magnitude of a galaxy in a needed photometric band, given its color and magnitude in the original band. It supports various optical and near intrared surveys, including SDSS, DECaLS, DELVE, UKIDSS, VHS, and VIKING, and provides conversions for both total and aperture magnitudes with apertures of 1.5", 2" or 3" diameters. The source code, useful for performing bulk calculations, is available in Python and IDL; the calculator is also offered as a web service.
https://ui.adsabs.harvard.edu/abs/2023PASP..135h4102T and the following sentence in the acknowledgements: This research made use of the "Color transformations calculator" service available at https://colors.voxastro.org.