Comparison between the forced photometry, WF, and the hybrid photometry scheme introduced in this work. Top: W1–W2 color calculated with the hybrid scheme against the same color but calculated with the WF photometry. Bottom: same but for W2–W3 color. The galaxies have been color-coded according to their extension in the WISE data (ext_flg=0 for point-like sources and ext_flg≠0 for extended sources). The black solid line is the y = x.