Binocular Colour Vision

Greyscale Demonstration

For printing-inks and video monitors, the visual response is not linear with the level of Black present.  The first example following is a linear scale of 'Percent Black'.  It is difficult to separate the 80% and 90% Black levels and nearly impossible to distinguish 90% and 100% Black.  In the darker ranges, the visual response is compressed so there are fewer levels distinguishable.
    This was noted a long time ago in the printing industry.  Tables of "Perceived Blackness" versus "Percent Area Inked" are standard.   The second image shows the percent Black needed to create a linear visual response for 'Value' (also referred to as 'Lightness' or 'Brightness').

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