True-color composite. Bands are assigned to the R / G / B display guns in the same order as the real-world colors — red → red gun, green → green gun, blue → blue gun — so the image looks roughly like what your eye would see.

• Landsat TM band mapping for true color: R = Band 3 (Red), G = Band 2 (Green), B = Band 1 (Blue).
• Landsat TM band numbering cheat sheet: 1-Blue, 2-Green, 3-Red, 4-NIR, 5-SWIR, 7-MIR, 6-Thermal (note 7 lies spectrally between 5 and 6 but is numbered out of order historically).
• On Landsat 8/9 (OLI): the same true-color recipe is R = B4, G = B3, B = B2 (band numbers shifted by one because OLI added Band 1 coastal/aerosol).