Hi- I photographed a local HS theater dress rehearsal. The noise on the background is pretty bad. I've gone through the noise tutorial. I am wondering if there is anything else that can be done or is this just what it is? Most images were shot over 1600 ISO, some much higher. I am seeing extra artifacts, blotches on the background. How high is too high to go with the luminance slider? I feel like the people get too soft and then worry about sharpening for print adding noise.
These two images are SOOR, with some noise reduction. The shadowing on left, top corner shows banding and noise... and the light blue artifact gets worse.
Thanks in advance for any advice.