The relation between log scene luminance and density in a camera negative is linear over a wide range.

A film scaner linearly encodes density in digital code values.

A LUT is used to simulate the characteristic of print film on a digital display.

The IP/IN prcoess creates a duplicate negative with the same relative density range as in the OCN.

The density in the recorded internegative is linear to digital code values.

CRT monitors and DLP projector have a non-linear charcteristic known as gamma-curve.

Motion picture print film has a S-shaped transfer curve.

The tonal characteristic of the projected image is not one-to-one with the original scene. Shadows and hilights are compressed; the midscale gamma is around 1.7

The digital display should match the projected image.