Spreading the tonal range means that you take full advantage of the tonal range of your display medium. In most cases this means maximizing the number of levels of gray between the deepest black and the brightest white that your display or broadcast speciﬁcations can reproduce. For most people reading this book, that means a TV screen or maybe a computer display. It can also mean prepping the image for a digital intermediate transfer to ﬁlm. Tonal range corrections do not always have to spread completely from 0% black to 100% white, but oftentimes they do. The other goal of tonal range corrections is determining if certain parts of the tonal range should be compressed while other parts
should be expanded. We’ll do a quick tutorial on this in a moment.