I’ve published this information regarding to ask of my friends. May be it also help you do not delete “bad” images or take quite good pictures in bad light situation. Difficulties of taking pictures on stage – it’s a good work of light engineers. They play all time with different color filters. I've never had have a possibility to adjust a right white color balance. I set usually “AWB” mode and in my Canon 5D – dual picture mode RAW+S-JPG. You can see a camera information on next picture. Next one shows a JPG that was delivered by camera. And this one – is a sample what possible to extract from RAW picture using 3 programs one after another: Digital Photo Professional(Canon) – Neat Image – Adobe Photoshop.