How do you know if an image is over- or under-exposed? Not talking about prior to taking the shot, but when you are looking at the image on your computer (JPG or RAW). (Please let's not argue why the exposure was incorrect in the first place prior to taking the shot, or even the JP*G/R*W discussion. Let's just take them as a given for this question. A few recent threads veer away from the original post when something arguable like this is brought up. ) I usually see that it is a bit dark or a bit blown here and there, but only from time to time. When reading some photography articles online, people say something like the camera tends "to be a tad over-exposed, so I'd set the camera to -0.03 EV". How do they know how much that "tad" is? When I try that amount of adjustment on an image, the difference is not too discernible to me. So - is it purely based on your trained eye, or is there a tool somewhere like in Lightroom, or Photoshop, or other software that tells you an image is not properly exposed?