It happens all the time. You have a feisty little one that insists on running so you try to keep up, then unknowingly you step into a poor lighting area, but the kid gives you that adorable look and you must snap the image....but oh no the shutter speed was too fast and now that perfect image is too dark :( JPEG only gives you so much room to adjust the image before it is seriously damaged. RAW gives you the control to save the image! So what do you do? Open the RAW image in ACR or equivalent and bump up the exposure, contrast, clarity and vibrance. Edit to taste. Where you would have to trash that perfect, but dark image in JPEG you can save and present from RAW.