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The effective wavelengths selected by X-loading, SPA, and RF for differentiating between the roasting degrees of the coffee beans.
| Methods | Effective Wavelengths (nm) |
|---|---|
| X-loading | 948, 1116, 1217, 1247, 1328, 1442, 1663 |
| SPA | 931, 1217, 1453, 1666, 1690 |
| RF | 931, 945, 1018, 1183, 1224, 1261, 1507, 1656 |
