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The second Gaia data release (DR2) delivers accurate and homogeneousphotometry data of the whole sky to an exquisite quality, reaching down to theunprecedented milli-magnitude (mmag) level for the G, GRP, and GBP passbands.However, the presence of magnitude-dependent systematic effects at the 10 mmaglevel limits its power in scientific exploitation. In this work, using abouthalf-million stars in common with the LAMOST DR5, we apply thespectroscopy-based stellar color regression method to calibrate the Gaia G-GRPand GBP-GRP colors. With an unprecedented precision of about 1 mmag, systematictrends with G magnitude are revealed for both colors in great detail,reflecting changes in instrument configurations. Color dependent trends arefound for the GBP-GRP color and for stars brighter than G~11.5 mag. Thecalibration is up to 20 mmag in general and varies a few mmag/mag. A revisedcolor-color diagram of Gaia DR2 is given, and some applications are brieflydiscussed.

Correction to the photometric colors of the Gaia Data Release 2 with the stellar color regression method