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Brightness adjustment leads to oversaturation

Using the -b option to adjust the brightness of the output image increases the color saturation for any brightness > 1. This is particularly noticeable for large brightness values (e.g. 16) for which the colors start looking entirely unrealistic. A benchmark comparison can be done by doing the exposure adjustment in Photoshop (Camera Raw) or Lightroom instead. Is the underlying algorithm flawed or does the -b option need to get used in conjunction with some other setting ?