My assistant just gave me her card of images from a wedding she helped me shoot, and she accidentally had her camera metering set to low key, and it was a cloudy overcast day, so a lot of the crucial family photos I had her do solo are underexposed. When I try to fix the exposure in lightroom and/or photoshop there is an obscene amount of red noise and grain. I can minimize it using smart blur on the colour channels, but I need to blur so much the image starts looking like a painting and it ruins the color balance. HELP PLEASE!! any ideas?