why are the results different between a color image that has been desaturated using a hue/saturation adjustment, compared to the same color image that's [/i]image mode is set to grayscale[/i]? what does a hue/saturation adjustment do differently than setting an images' image mode to grayscale?
Could it be because a grayscale image recieves no adjustments from your color workspace in PS, while a color image you've desaturated is still subject to adjustments from the working or preview profile?