What exactly does the “destination gamut warning” and the “monitor gamut warning” indicate?

This information applies to version(s): 6, 7

Activating the destination gamut warning by clicking on the corresponding icon will show you which colors in the displayed image cannot be precisely reproduced in the destination colorspace. This mainly occurs with particular hues or saturated colors that fall outside of your chosen destination device’s gamut.

Activating this monitor gamut warning by clicking on the corresponding icon will show you which colors in the displayed image cannot be precisely reproduced on your monitor. This mainly occurs with particular hues or saturated colors that fall outside of your monitor’s gamut.