Zone 0 - Pure black, no details or texture visible.
Zone 1 - Black tone but no texture. This is normally as black as you want to get in a picture.
Zone 2 - First hint of texture and detail, very deep shadow.
Zone 3 - Dark materials, details visible.
Zone 4 - Dark foliage. Dark stone. Landscape shadow. Shadow on portraits in sunlight.
Zone [...]
educational technology * open source * learning matters
