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**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).

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