User Manual - pancroma

is unlikely that the settings will be optimal for any particular image but theyshould be better than the default in any case. The settings are restored to thedefault when Brovey processing is done.)The SPECTRAL algorithm was originally conceived as a method for pansharpening single multispectral or hyperspectral bands. It introduces very lowspectral distortion into the pan sharpening process, and can also be used toproduce virtually spectral distortion-free color composite images as well.The most recent algorithm is the ELIN Local Optimization addition to the basicHSI transformation. This method produces a synthetic panchromatic band withvirtually zero spectral distortion regardless of the condition of the originalpanchromatic band. It usually produces the best results of all, especially forLandsat scenes where the panchromatic band sensitivity is shifted toward longerwavelengths. However, processing times can be considerably longer as thealgorithm requires a lot of computation for each synthesized pixel. ELIN LocalOptimization is the default setting for HSI pan sharpening. It can be switched offif not needed by un-checking the box on the pan sharpening data entry screen.51