Archived posting to the Leica Users Group, 1999/09/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Anthony Atkielski wrote: > I'd like to know why the reference is 18% gray, rather than, say, 50% gray, > which seems more logical. > Good observation. Not only would it be more logical, but that's really what it is. 18% grey is a misnomer. It means 18% reflectance. It's actually 50-50 black and white. If you take a piece of paper and print an equal number of tiny black and white squares on it in a checkerboard pattern, it will average out to about "18% grey," or 18% reflectance. Richard S.