Band Combination 3-2-1 on Landsat TM:

🟥 R display gun ← Band 3 (Red)
🟩 G display gun ← Band 2 (Green)
🟦 B display gun ← Band 1 (Blue)

Each band feeds the matching color gun → image looks roughly natural.

⚠️ On Landsat 8/9 OLI (numbering shifted by 1 because coastal/aerosol = Band 1): - 🟥 R ← Band 4 (Red) - 🟩 G ← Band 3 (Green) - 🟦 B ← Band 2 (Blue)

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True color = 3-2-1 countdown (on TM). Each band matches its real color. OLI just shifts everything up by 1.

airborne/true-color-bands