Example of DR correction. The left panels show the original photometry and the right panels the one corrected for differential reddening. The top panels illustrate the case of NGC 6366 in the (V, B − V) CMD plane, the bottom panels show NGC 4833 in the (V, U − V) CMD plane. The points are colored according to the density of stars in the CMD, with black being the lowest density and yellow the highest one.