Although it's been several years that I've using my digital camera, playing with photoshop, and studying things online (like these forums), I still haven't come to a clear understanding in my mind what exactly "tone" means when some talks about "tonal range", for instance. Is it /just/ about the regions on a histogram? If so, then I interpret "tone" to somewhat synomous with "brightness". Sometimes when it's used, it seems that "tone" includes color as well as brightness. Does a single "tone", for example, correspond to a single RGB value, e.g., 222-178-89? I hope this question doesn't sound to naive, but I just can't quite determine its meaning from the usages I've run across.