I’m no expert, but I’ve read that the majority of the surface is dark like as asphalt. They bumped up the exposure to bring out detail in the dark surface, but that blows out anything that’s brighter than the dark surface. So the bright spots may be barely white, or gray.
That makes sense. Yep totally blown out.
You’d think they would have been more focused on these bright areas since they knew these features existed when the spacecraft imaged Ceres on approach long ago. I am surprised they didn’t shoot the target using several different exposures/filters etc. I think one of the cameras has 7 different filters, infrared mapping spectrometers etc.
Even at a distance of 45k kilometers back in February, these bright spots seemed extremely bright. Or were possibly captured using longer exposures back then as well.