JES Deinterlacer Color Settings

Brightness

A value large than 1.00 raises the overall brightness of the image. White and black remain the same but the middle part of the brightness spectrum is shifted up (or down if the value is less than 1.00).
This is similar to but not the same as a gamma transform (which also affects colors).

White level

A white level change compresses or expands the upper range of brightness values. A value larger than 1 makes the image darker, a value less then one makes it brighter.

Black level

A black level change compresses or expands the lower range of brightness values. A value larger than 0 makes the image darker, a value less then 0 makes it less dark.

Saturation

Use this setting to make colors deeper or paler. For example a value 1.1 makes colors deeper, 0.9 makes them paler.
Setting this value to 0 results in a greyscale image.

Remarks

Black level and white level settings can be combined to reduce or increase contrast. For example, setting white level to 0.9 and black level to 0.1 increases contrast. Setting white level to 1.1 and black level to -0.1 reduces contrast.
Most color operations can be reverted, at the cost of some round-off error. A contrast increase cannot be undone completely (you lose the darkest and brightest parts).
If you make all three kinds of changes, the order of operation is: contrast, brightness, saturation.